31857828987077 has 16 divisors (see below), whose sum is σ = 32962847384880. Its totient is φ = 30768520704000.

The previous prime is 31857828987071. The next prime is 31857828987107. The reversal of 31857828987077 is 77078982875813.

It is a Cunningham number, because it is equal to 5644274²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 31857828987076 = 1^2 + 5644274^2 .

It is a cyclic number.

It is not a de Polignac number, because 31857828987077 - 2³² = 31853534019781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31857828986992 and 31857828987010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31857828987071) 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, 27563549 + ... + 28696077.

It is an arithmetic number, because the mean of its divisors is an integer number (2060177961555).

Almost surely, 2^{31857828987077} is an apocalyptic number.

It is an amenable number.

31857828987077 is a deficient number, since it is larger than the sum of its proper divisors (1105018397803).

31857828987077 is a wasteful number, since it uses less digits than its factorization.

31857828987077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139464.

The product of its (nonzero) digits is 2655313920, while the sum is 80.

The spelling of 31857828987077 in words is "thirty-one trillion, eight hundred fifty-seven billion, eight hundred twenty-eight million, nine hundred eighty-seven thousand, seventy-seven".