31123212322357 has 2 divisors, whose sum is σ = 31123212322358. Its totient is φ = 31123212322356.

The previous prime is 31123212322297. The next prime is 31123212322369. The reversal of 31123212322357 is 75322321232113.

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., 30332181741156 + 791030581201 = 5507466^2 + 889399^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123212322357 - 2³¹ = 31121064838709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123212320357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561606161178 + 15561606161179.

It is an arithmetic number, because the mean of its divisors is an integer number (15561606161179).

Almost surely, 2^{31123212322357} is an apocalyptic number.

It is an amenable number.

31123212322357 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123212322357 is an equidigital number, since it uses as much as digits as its factorization.

31123212322357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 37.

The spelling of 31123212322357 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred twelve million, three hundred twenty-two thousand, three hundred fifty-seven".