31416305521 has 4 divisors (see below), whose sum is σ = 32782231872. Its totient is φ = 30050379172.

The previous prime is 31416305489. The next prime is 31416305537. The reversal of 31416305521 is 12550361413.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12550361413 = 89119 ⋅140827.

It is a cyclic number.

It is not a de Polignac number, because 31416305521 - 2⁵ = 31416305489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31416305581) 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, 682963141 + ... + 682963186.

It is an arithmetic number, because the mean of its divisors is an integer number (8195557968).

Almost surely, 2^31416305521 is an apocalyptic number.

It is an amenable number.

31416305521 is a deficient number, since it is larger than the sum of its proper divisors (1365926351).

31416305521 is a wasteful number, since it uses less digits than its factorization.

31416305521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365926350.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 31416305521 its reverse (12550361413), we get a palindrome (43966666934).

The spelling of 31416305521 in words is "thirty-one billion, four hundred sixteen million, three hundred five thousand, five hundred twenty-one".