634709987 has 2 divisors, whose sum is σ = 634709988. Its totient is φ = 634709986.

The previous prime is 634709969. The next prime is 634709993. The reversal of 634709987 is 789907436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634709987 - 2⁶ = 634709923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634700987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317354993 + 317354994.

It is an arithmetic number, because the mean of its divisors is an integer number (317354994).

Almost surely, 2^634709987 is an apocalyptic number.

634709987 is a deficient number, since it is larger than the sum of its proper divisors (1).

634709987 is an equidigital number, since it uses as much as digits as its factorization.

634709987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 634709987 is about 25193.4512721064. The cubic root of 634709987 is about 859.3929314993.

The spelling of 634709987 in words is "six hundred thirty-four million, seven hundred nine thousand, nine hundred eighty-seven".