31520406427 has 2 divisors, whose sum is σ = 31520406428. Its totient is φ = 31520406426.

The previous prime is 31520406361. The next prime is 31520406431. The reversal of 31520406427 is 72460402513.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31520406427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31520406392 and 31520406401.

It is not a weakly prime, because it can be changed into another prime (31520406527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760203213 + 15760203214.

It is an arithmetic number, because the mean of its divisors is an integer number (15760203214).

Almost surely, 2^31520406427 is an apocalyptic number.

31520406427 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520406427 is an equidigital number, since it uses as much as digits as its factorization.

31520406427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 31520406427 in words is "thirty-one billion, five hundred twenty million, four hundred six thousand, four hundred twenty-seven".