31780102057 has 4 divisors (see below), whose sum is σ = 34669202256. Its totient is φ = 28891001860.

The previous prime is 31780102043. The next prime is 31780102091. The reversal of 31780102057 is 75020108713.

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 a cyclic number.

It is not a de Polignac number, because 31780102057 - 2¹⁹ = 31779577769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31780102007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444550083 + ... + 1444550104.

It is an arithmetic number, because the mean of its divisors is an integer number (8667300564).

Almost surely, 2^31780102057 is an apocalyptic number.

It is an amenable number.

31780102057 is a deficient number, since it is larger than the sum of its proper divisors (2889100199).

31780102057 is a wasteful number, since it uses less digits than its factorization.

31780102057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889100198.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 31780102057 in words is "thirty-one billion, seven hundred eighty million, one hundred two thousand, fifty-seven".