31103431493 has 2 divisors, whose sum is σ = 31103431494. Its totient is φ = 31103431492.

The previous prime is 31103431487. The next prime is 31103431561. The reversal of 31103431493 is 39413430113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20056790884 + 11046640609 = 141622^2 + 105103^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103431493 - 2⁴ = 31103431477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31103431453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551715746 + 15551715747.

It is an arithmetic number, because the mean of its divisors is an integer number (15551715747).

Almost surely, 2^31103431493 is an apocalyptic number.

It is an amenable number.

31103431493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103431493 is an equidigital number, since it uses as much as digits as its factorization.

31103431493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 31103431493 in words is "thirty-one billion, one hundred three million, four hundred thirty-one thousand, four hundred ninety-three".