31390477 has 2 divisors, whose sum is σ = 31390478. Its totient is φ = 31390476.

The previous prime is 31390433. The next prime is 31390481. The reversal of 31390477 is 77409313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30791401 + 599076 = 5549^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 31390477 - 2⁷ = 31390349 is a prime.

It is equal to p_1938553 and since 31390477 and 1938553 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31390427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15695238 + 15695239.

It is an arithmetic number, because the mean of its divisors is an integer number (15695239).

Almost surely, 2^31390477 is an apocalyptic number.

It is an amenable number.

31390477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31390477 is an equidigital number, since it uses as much as digits as its factorization.

31390477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 31390477 is about 5602.7204999000. The cubic root of 31390477 is about 315.4515301649.

The spelling of 31390477 in words is "thirty-one million, three hundred ninety thousand, four hundred seventy-seven".