31012169477 has 2 divisors, whose sum is σ = 31012169478. Its totient is φ = 31012169476.

The previous prime is 31012169459. The next prime is 31012169479. The reversal of 31012169477 is 77496121013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16261095361 + 14751074116 = 127519^2 + 121454^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012169477 - 2¹² = 31012165381 is a prime.

Together with 31012169479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012169479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506084738 + 15506084739.

It is an arithmetic number, because the mean of its divisors is an integer number (15506084739).

Almost surely, 2^31012169477 is an apocalyptic number.

It is an amenable number.

31012169477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012169477 is an equidigital number, since it uses as much as digits as its factorization.

31012169477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 31012169477 in words is "thirty-one billion, twelve million, one hundred sixty-nine thousand, four hundred seventy-seven".