981699931 has 2 divisors, whose sum is σ = 981699932. Its totient is φ = 981699930.

The previous prime is 981699919. The next prime is 981699989. The reversal of 981699931 is 139996189.

It is a weak prime.

It is an emirp because it is prime and its reverse (139996189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981699931 - 2¹⁷ = 981568859 is a prime.

It is a super-2 number, since 2×981699931² = 1927469509050809522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (981697931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490849965 + 490849966.

It is an arithmetic number, because the mean of its divisors is an integer number (490849966).

Almost surely, 2^981699931 is an apocalyptic number.

981699931 is a deficient number, since it is larger than the sum of its proper divisors (1).

981699931 is an equidigital number, since it uses as much as digits as its factorization.

981699931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 55.

The square root of 981699931 is about 31332.0910728920. The cubic root of 981699931 is about 993.8623837353.

The spelling of 981699931 in words is "nine hundred eighty-one million, six hundred ninety-nine thousand, nine hundred thirty-one".