15406022641 has 3 divisors (see below), whose sum is σ = 15406146763. Its totient is φ = 15405898520.

The previous prime is 15406022629. The next prime is 15406022701. The reversal of 15406022641 is 14622060451.

It is a happy number.

The square root of 15406022641 is 124121.

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., 7591462641 + 7814560000 = 87129^2 + 88400^2 .

It is not a de Polignac number, because 15406022641 - 2⁹ = 15406022129 is a prime.

It is a super-2 number, since 2×15406022641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15406022141) 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, 62061 + ... + 186181.

Almost surely, 2^15406022641 is an apocalyptic number.

15406022641 is the 124121-st square number.

15406022641 is the 62061-st centered octagonal number.

It is an amenable number.

15406022641 is a deficient number, since it is larger than the sum of its proper divisors (124122).

15406022641 is an frugal number, since it uses more digits than its factorization.

15406022641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248242 (or 124121 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 15406022641 in words is "fifteen billion, four hundred six million, twenty-two thousand, six hundred forty-one".