31245983381 has 2 divisors, whose sum is σ = 31245983382. Its totient is φ = 31245983380.

The previous prime is 31245983269. The next prime is 31245983449. The reversal of 31245983381 is 18338954213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21482764900 + 9763218481 = 146570^2 + 98809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31245983381 is a prime.

It is a super-2 number, since 2×31245983381² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31245989381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622991690 + 15622991691.

It is an arithmetic number, because the mean of its divisors is an integer number (15622991691).

Almost surely, 2^31245983381 is an apocalyptic number.

It is an amenable number.

31245983381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245983381 is an equidigital number, since it uses as much as digits as its factorization.

31245983381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 47.

The spelling of 31245983381 in words is "thirty-one billion, two hundred forty-five million, nine hundred eighty-three thousand, three hundred eighty-one".