31948387357 has 2 divisors, whose sum is σ = 31948387358. Its totient is φ = 31948387356.

The previous prime is 31948387301. The next prime is 31948387363. The reversal of 31948387357 is 75378384913.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29121763801 + 2826623556 = 170651^2 + 53166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31948387357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31948387397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15974193678 + 15974193679.

It is an arithmetic number, because the mean of its divisors is an integer number (15974193679).

Almost surely, 2^31948387357 is an apocalyptic number.

It is an amenable number.

31948387357 is a deficient number, since it is larger than the sum of its proper divisors (1).

31948387357 is an equidigital number, since it uses as much as digits as its factorization.

31948387357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 58.

The spelling of 31948387357 in words is "thirty-one billion, nine hundred forty-eight million, three hundred eighty-seven thousand, three hundred fifty-seven".