31158315319 has 2 divisors, whose sum is σ = 31158315320. Its totient is φ = 31158315318.

The previous prime is 31158315311. The next prime is 31158315373. The reversal of 31158315319 is 91351385113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31158315319 - 2³ = 31158315311 is a prime.

It is a super-2 number, since 2×31158315319² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31158315311) 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, 15579157659 + 15579157660.

It is an arithmetic number, because the mean of its divisors is an integer number (15579157660).

Almost surely, 2^31158315319 is an apocalyptic number.

31158315319 is a deficient number, since it is larger than the sum of its proper divisors (1).

31158315319 is an equidigital number, since it uses as much as digits as its factorization.

31158315319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 40.

The spelling of 31158315319 in words is "thirty-one billion, one hundred fifty-eight million, three hundred fifteen thousand, three hundred nineteen".