31349239157 has 2 divisors, whose sum is σ = 31349239158. Its totient is φ = 31349239156.

The previous prime is 31349239091. The next prime is 31349239193. The reversal of 31349239157 is 75193294313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24340368196 + 7008870961 = 156014^2 + 83719^2 .

It is a cyclic number.

It is not a de Polignac number, because 31349239157 - 2¹⁰ = 31349238133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31349232157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15674619578 + 15674619579.

It is an arithmetic number, because the mean of its divisors is an integer number (15674619579).

Almost surely, 2^31349239157 is an apocalyptic number.

It is an amenable number.

31349239157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31349239157 is an equidigital number, since it uses as much as digits as its factorization.

31349239157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 47.

The spelling of 31349239157 in words is "thirty-one billion, three hundred forty-nine million, two hundred thirty-nine thousand, one hundred fifty-seven".