31123319 has 2 divisors, whose sum is σ = 31123320. Its totient is φ = 31123318.

The previous prime is 31123303. The next prime is 31123343. The reversal of 31123319 is 91332113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31123319 - 2⁴ = 31123303 is a prime.

It is a super-2 number, since 2×31123319² = 1937321971151522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31123294 and 31123303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561659 + 15561660.

It is an arithmetic number, because the mean of its divisors is an integer number (15561660).

It is a self-describing number.

Almost surely, 2^31123319 is an apocalyptic number.

31123319 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123319 is an equidigital number, since it uses as much as digits as its factorization.

31123319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 23.

The square root of 31123319 is about 5578.8277442488. The cubic root of 31123319 is about 314.5540645586.

The spelling of 31123319 in words is "thirty-one million, one hundred twenty-three thousand, three hundred nineteen".