1988617931 has 2 divisors, whose sum is σ = 1988617932. Its totient is φ = 1988617930.

The previous prime is 1988617907. The next prime is 1988617949. The reversal of 1988617931 is 1397168891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1988617931 - 2⁶ = 1988617867 is a prime.

It is a super-2 number, since 2×1988617931² = 7909202550989441522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1988617901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994308965 + 994308966.

It is an arithmetic number, because the mean of its divisors is an integer number (994308966).

Almost surely, 2^1988617931 is an apocalyptic number.

1988617931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988617931 is an equidigital number, since it uses as much as digits as its factorization.

1988617931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 53.

The square root of 1988617931 is about 44593.9225792035. The cubic root of 1988617931 is about 1257.5264167662.

The spelling of 1988617931 in words is "one billion, nine hundred eighty-eight million, six hundred seventeen thousand, nine hundred thirty-one".