31402863557 has 4 divisors (see below), whose sum is σ = 33818468460. Its totient is φ = 28987258656.

The previous prime is 31402863497. The next prime is 31402863587. The reversal of 31402863557 is 75536820413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75536820413 = 19 ⋅3975622127.

It can be written as a sum of positive squares in 2 ways, for example, as 11412862561 + 19990000996 = 106831^2 + 141386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31402863557 is a prime.

It is a super-2 number, since 2×31402863557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402863587) 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, 1207802432 + ... + 1207802457.

It is an arithmetic number, because the mean of its divisors is an integer number (8454617115).

Almost surely, 2^31402863557 is an apocalyptic number.

It is an amenable number.

31402863557 is a deficient number, since it is larger than the sum of its proper divisors (2415604903).

31402863557 is a wasteful number, since it uses less digits than its factorization.

31402863557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415604902.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 31402863557 in words is "thirty-one billion, four hundred two million, eight hundred sixty-three thousand, five hundred fifty-seven".