31641150561 has 4 divisors (see below), whose sum is σ = 42188200752. Its totient is φ = 21094100372.

The previous prime is 31641150551. The next prime is 31641150571. The reversal of 31641150561 is 16505114613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (31641150551) and next prime (31641150571).

It is a cyclic number.

It is not a de Polignac number, because 31641150561 - 2⁵ = 31641150529 is a prime.

It is a super-2 number, since 2×31641150561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31641150551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5273525091 + ... + 5273525096.

It is an arithmetic number, because the mean of its divisors is an integer number (10547050188).

Almost surely, 2^31641150561 is an apocalyptic number.

It is an amenable number.

31641150561 is a deficient number, since it is larger than the sum of its proper divisors (10547050191).

31641150561 is a wasteful number, since it uses less digits than its factorization.

31641150561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10547050190.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 31641150561 in words is "thirty-one billion, six hundred forty-one million, one hundred fifty thousand, five hundred sixty-one".