4220431988161 has 3 divisors (see below), whose sum is σ = 4220434042531. Its totient is φ = 4220429933792.

The previous prime is 4220431988153. The next prime is 4220431988173. The reversal of 4220431988161 is 1618891340224.

The square root of 4220431988161 is 2054369.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 36978561 + 4220395009600 = 6081^2 + 2054360^2 .

It is not a de Polignac number, because 4220431988161 - 2³ = 4220431988153 is a prime.

It is a super-2 number, since 2×4220431988161² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4220431988131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1027185 + ... + 3081553.

Almost surely, 2^{4220431988161} is an apocalyptic number.

4220431988161 is the 2054369-th square number.

4220431988161 is the 1027185-th centered octagonal number.

It is an amenable number.

4220431988161 is a deficient number, since it is larger than the sum of its proper divisors (2054370).

4220431988161 is an frugal number, since it uses more digits than its factorization.

4220431988161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108738 (or 2054369 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

Multiplying 4220431988161 by its sum of digits (49), we get a square (206801167419889 = 14380583²).

The spelling of 4220431988161 in words is "four trillion, two hundred twenty billion, four hundred thirty-one million, nine hundred eighty-eight thousand, one hundred sixty-one".