31373431 has 2 divisors, whose sum is σ = 31373432. Its totient is φ = 31373430.

The previous prime is 31373417. The next prime is 31373437. The reversal of 31373431 is 13437313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31373431 - 2¹¹ = 31371383 is a prime.

It is a super-2 number, since 2×31373431² = 1968584345423522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31373396 and 31373405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31373437) 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, 15686715 + 15686716.

It is an arithmetic number, because the mean of its divisors is an integer number (15686716).

Almost surely, 2^31373431 is an apocalyptic number.

31373431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31373431 is an equidigital number, since it uses as much as digits as its factorization.

31373431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 25.

The square root of 31373431 is about 5601.1990680568. The cubic root of 31373431 is about 315.3944198465.

The spelling of 31373431 in words is "thirty-one million, three hundred seventy-three thousand, four hundred thirty-one".