31779677473 has 2 divisors, whose sum is σ = 31779677474. Its totient is φ = 31779677472.

The previous prime is 31779677441. The next prime is 31779677483. The reversal of 31779677473 is 37477697713.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31306701969 + 472975504 = 176937^2 + 21748^2 .

It is a cyclic number.

It is not a de Polignac number, because 31779677473 - 2⁵ = 31779677441 is a prime.

It is not a weakly prime, because it can be changed into another prime (31779677483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15889838736 + 15889838737.

It is an arithmetic number, because the mean of its divisors is an integer number (15889838737).

Almost surely, 2^31779677473 is an apocalyptic number.

It is an amenable number.

31779677473 is a deficient number, since it is larger than the sum of its proper divisors (1).

31779677473 is an equidigital number, since it uses as much as digits as its factorization.

31779677473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32672808, while the sum is 61.

The spelling of 31779677473 in words is "thirty-one billion, seven hundred seventy-nine million, six hundred seventy-seven thousand, four hundred seventy-three".