31540325447 has 2 divisors, whose sum is σ = 31540325448. Its totient is φ = 31540325446.

The previous prime is 31540325429. The next prime is 31540325449. The reversal of 31540325447 is 74452304513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31540325447 - 2¹⁶ = 31540259911 is a prime.

Together with 31540325449, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31540325447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31540325449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770162723 + 15770162724.

It is an arithmetic number, because the mean of its divisors is an integer number (15770162724).

Almost surely, 2^31540325447 is an apocalyptic number.

31540325447 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540325447 is an equidigital number, since it uses as much as digits as its factorization.

31540325447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 38.

The spelling of 31540325447 in words is "thirty-one billion, five hundred forty million, three hundred twenty-five thousand, four hundred forty-seven".