690982987 has 2 divisors, whose sum is σ = 690982988. Its totient is φ = 690982986.

The previous prime is 690982979. The next prime is 690983047. The reversal of 690982987 is 789289096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690982987 - 2³ = 690982979 is a prime.

It is not a weakly prime, because it can be changed into another prime (690982907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345491493 + 345491494.

It is an arithmetic number, because the mean of its divisors is an integer number (345491494).

Almost surely, 2^690982987 is an apocalyptic number.

690982987 is a deficient number, since it is larger than the sum of its proper divisors (1).

690982987 is an equidigital number, since it uses as much as digits as its factorization.

690982987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 690982987 is about 26286.5552516871. Note that the first 3 decimals coincide. The cubic root of 690982987 is about 884.0750172649.

The spelling of 690982987 in words is "six hundred ninety million, nine hundred eighty-two thousand, nine hundred eighty-seven".