31425139477 has 2 divisors, whose sum is σ = 31425139478. Its totient is φ = 31425139476.

The previous prime is 31425139463. The next prime is 31425139513. The reversal of 31425139477 is 77493152413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20595407121 + 10829732356 = 143511^2 + 104066^2 .

It is a cyclic number.

It is not a de Polignac number, because 31425139477 - 2⁷ = 31425139349 is a prime.

It is a super-2 number, since 2×31425139477² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31425139457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15712569738 + 15712569739.

It is an arithmetic number, because the mean of its divisors is an integer number (15712569739).

Almost surely, 2^31425139477 is an apocalyptic number.

It is an amenable number.

31425139477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31425139477 is an equidigital number, since it uses as much as digits as its factorization.

31425139477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 46.

The spelling of 31425139477 in words is "thirty-one billion, four hundred twenty-five million, one hundred thirty-nine thousand, four hundred seventy-seven".