31044497381 has 2 divisors, whose sum is σ = 31044497382. Its totient is φ = 31044497380.

The previous prime is 31044497371. The next prime is 31044497389. The reversal of 31044497381 is 18379444013.

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., 22924685281 + 8119812100 = 151409^2 + 90110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31044497381 is a prime.

It is a super-2 number, since 2×31044497381² (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 (31044497389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15522248690 + 15522248691.

It is an arithmetic number, because the mean of its divisors is an integer number (15522248691).

Almost surely, 2^31044497381 is an apocalyptic number.

It is an amenable number.

31044497381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31044497381 is an equidigital number, since it uses as much as digits as its factorization.

31044497381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 31044497381 in words is "thirty-one billion, forty-four million, four hundred ninety-seven thousand, three hundred eighty-one".