31793253857 has 2 divisors, whose sum is σ = 31793253858. Its totient is φ = 31793253856.

The previous prime is 31793253841. The next prime is 31793253881. The reversal of 31793253857 is 75835239713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21911104576 + 9882149281 = 148024^2 + 99409^2 .

It is a cyclic number.

It is not a de Polignac number, because 31793253857 - 2⁴ = 31793253841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31793253799 and 31793253808.

It is not a weakly prime, because it can be changed into another prime (31793253827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15896626928 + 15896626929.

It is an arithmetic number, because the mean of its divisors is an integer number (15896626929).

Almost surely, 2^31793253857 is an apocalyptic number.

It is an amenable number.

31793253857 is a deficient number, since it is larger than the sum of its proper divisors (1).

31793253857 is an equidigital number, since it uses as much as digits as its factorization.

31793253857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 53.

The spelling of 31793253857 in words is "thirty-one billion, seven hundred ninety-three million, two hundred fifty-three thousand, eight hundred fifty-seven".