31374789157 has 2 divisors, whose sum is σ = 31374789158. Its totient is φ = 31374789156.

The previous prime is 31374789151. The next prime is 31374789181. The reversal of 31374789157 is 75198747313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19074648321 + 12300140836 = 138111^2 + 110906^2 .

It is an emirp because it is prime and its reverse (75198747313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31374789157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31374789098 and 31374789107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31374789151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15687394578 + 15687394579.

It is an arithmetic number, because the mean of its divisors is an integer number (15687394579).

Almost surely, 2^31374789157 is an apocalyptic number.

It is an amenable number.

31374789157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31374789157 is an equidigital number, since it uses as much as digits as its factorization.

31374789157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The spelling of 31374789157 in words is "thirty-one billion, three hundred seventy-four million, seven hundred eighty-nine thousand, one hundred fifty-seven".