31133947477 has 2 divisors, whose sum is σ = 31133947478. Its totient is φ = 31133947476.

The previous prime is 31133947459. The next prime is 31133947501. The reversal of 31133947477 is 77474933113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28282494276 + 2851453201 = 168174^2 + 53399^2 .

It is a cyclic number.

It is not a de Polignac number, because 31133947477 - 2²³ = 31125558869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31133947477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31133947417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566973738 + 15566973739.

It is an arithmetic number, because the mean of its divisors is an integer number (15566973739).

Almost surely, 2^31133947477 is an apocalyptic number.

It is an amenable number.

31133947477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133947477 is an equidigital number, since it uses as much as digits as its factorization.

31133947477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 49.

The spelling of 31133947477 in words is "thirty-one billion, one hundred thirty-three million, nine hundred forty-seven thousand, four hundred seventy-seven".