31401885557 has 16 divisors (see below), whose sum is σ = 36138795264. Its totient is φ = 26727840000.

The previous prime is 31401885517. The next prime is 31401885577. The reversal of 31401885557 is 75558810413.

It is a cyclic number.

It is not a de Polignac number, because 31401885557 - 2¹⁰ = 31401884533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401885517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5684957 + ... + 5690477.

It is an arithmetic number, because the mean of its divisors is an integer number (2258674704).

Almost surely, 2^31401885557 is an apocalyptic number.

It is an amenable number.

31401885557 is a deficient number, since it is larger than the sum of its proper divisors (4736909707).

31401885557 is a wasteful number, since it uses less digits than its factorization.

31401885557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 31401885557 in words is "thirty-one billion, four hundred one million, eight hundred eighty-five thousand, five hundred fifty-seven".