315788881 has 2 divisors, whose sum is σ = 315788882. Its totient is φ = 315788880.

The previous prime is 315788849. The next prime is 315788899. The reversal of 315788881 is 188887513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223801600 + 91987281 = 14960^2 + 9591^2 .

It is a cyclic number.

It is not a de Polignac number, because 315788881 - 2⁵ = 315788849 is a prime.

It is a super-2 number, since 2×315788881² = 199445234726464322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315788581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157894440 + 157894441.

It is an arithmetic number, because the mean of its divisors is an integer number (157894441).

Almost surely, 2^315788881 is an apocalyptic number.

It is an amenable number.

315788881 is a deficient number, since it is larger than the sum of its proper divisors (1).

315788881 is an equidigital number, since it uses as much as digits as its factorization.

315788881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 430080, while the sum is 49.

The square root of 315788881 is about 17770.4496566632. The cubic root of 315788881 is about 680.9767400987.

The spelling of 315788881 in words is "three hundred fifteen million, seven hundred eighty-eight thousand, eight hundred eighty-one".