634709993 has 2 divisors, whose sum is σ = 634709994. Its totient is φ = 634709992.

The previous prime is 634709987. The next prime is 634710017. The reversal of 634709993 is 399907436.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370062169 + 264647824 = 19237^2 + 16268^2 .

It is a cyclic number.

It is not a de Polignac number, because 634709993 - 2⁸ = 634709737 is a prime.

It is not a weakly prime, because it can be changed into another prime (634709923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317354996 + 317354997.

It is an arithmetic number, because the mean of its divisors is an integer number (317354997).

Almost surely, 2^634709993 is an apocalyptic number.

It is an amenable number.

634709993 is a deficient number, since it is larger than the sum of its proper divisors (1).

634709993 is an equidigital number, since it uses as much as digits as its factorization.

634709993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 634709993 is about 25193.4513911850. The cubic root of 634709993 is about 859.3929342073.

The spelling of 634709993 in words is "six hundred thirty-four million, seven hundred nine thousand, nine hundred ninety-three".