3935783822161 has 3 divisors (see below), whose sum is σ = 3935785806043. Its totient is φ = 3935781838280.

The previous prime is 3935783822149. The next prime is 3935783822207. The reversal of 3935783822161 is 1612283875393.

It is a happy number.

The square root of 3935783822161 is 1983881.

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., 2082482772561 + 1853301049600 = 1443081^2 + 1361360^2 .

It is not a de Polignac number, because 3935783822161 - 2¹⁷ = 3935783691089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3935783822096 and 3935783822105.

It is not an unprimeable number, because it can be changed into a prime (3935783822561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 991941 + ... + 2975821.

Almost surely, 2^{3935783822161} is an apocalyptic number.

3935783822161 is the 1983881-st square number.

3935783822161 is the 991941-st centered octagonal number.

It is an amenable number.

3935783822161 is a deficient number, since it is larger than the sum of its proper divisors (1983882).

3935783822161 is an frugal number, since it uses more digits than its factorization.

3935783822161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967762 (or 1983881 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 3935783822161 in words is "three trillion, nine hundred thirty-five billion, seven hundred eighty-three million, eight hundred twenty-two thousand, one hundred sixty-one".