635616997 has 2 divisors, whose sum is σ = 635616998. Its totient is φ = 635616996.

The previous prime is 635616979. The next prime is 635617001. The reversal of 635616997 is 799616536.

Together with previous prime (635616979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421316676 + 214300321 = 20526^2 + 14639^2 .

It is a cyclic number.

It is not a de Polignac number, because 635616997 - 2²³ = 627228389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635616967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317808498 + 317808499.

It is an arithmetic number, because the mean of its divisors is an integer number (317808499).

Almost surely, 2^635616997 is an apocalyptic number.

It is an amenable number.

635616997 is a deficient number, since it is larger than the sum of its proper divisors (1).

635616997 is an equidigital number, since it uses as much as digits as its factorization.

635616997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 52.

The square root of 635616997 is about 25211.4457538635. The cubic root of 635616997 is about 859.8020984144.

The spelling of 635616997 in words is "six hundred thirty-five million, six hundred sixteen thousand, nine hundred ninety-seven".