31504551493 has 2 divisors, whose sum is σ = 31504551494. Its totient is φ = 31504551492.

The previous prime is 31504551469. The next prime is 31504551557. The reversal of 31504551493 is 39415540513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19110850564 + 12393700929 = 138242^2 + 111327^2 .

It is a cyclic number.

It is not a de Polignac number, because 31504551493 - 2¹⁷ = 31504420421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31504551433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15752275746 + 15752275747.

It is an arithmetic number, because the mean of its divisors is an integer number (15752275747).

Almost surely, 2^31504551493 is an apocalyptic number.

It is an amenable number.

31504551493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31504551493 is an equidigital number, since it uses as much as digits as its factorization.

31504551493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 31504551493 in words is "thirty-one billion, five hundred four million, five hundred fifty-one thousand, four hundred ninety-three".