31920025477 has 2 divisors, whose sum is σ = 31920025478. Its totient is φ = 31920025476.

The previous prime is 31920025453. The next prime is 31920025547. The reversal of 31920025477 is 77452002913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29932114081 + 1987911396 = 173009^2 + 44586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31920025477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31920028477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15960012738 + 15960012739.

It is an arithmetic number, because the mean of its divisors is an integer number (15960012739).

Almost surely, 2^31920025477 is an apocalyptic number.

It is an amenable number.

31920025477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31920025477 is an equidigital number, since it uses as much as digits as its factorization.

31920025477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 31920025477 in words is "thirty-one billion, nine hundred twenty million, twenty-five thousand, four hundred seventy-seven".