634681051 has 2 divisors, whose sum is σ = 634681052. Its totient is φ = 634681050.

The previous prime is 634681031. The next prime is 634681081. The reversal of 634681051 is 150186436.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634681051 - 2¹⁵ = 634648283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634680998 and 634681016.

It is not a weakly prime, because it can be changed into another prime (634681031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317340525 + 317340526.

It is an arithmetic number, because the mean of its divisors is an integer number (317340526).

Almost surely, 2^634681051 is an apocalyptic number.

634681051 is a deficient number, since it is larger than the sum of its proper divisors (1).

634681051 is an equidigital number, since it uses as much as digits as its factorization.

634681051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 634681051 is about 25192.8769893397. The cubic root of 634681051 is about 859.3798715863.

The spelling of 634681051 in words is "six hundred thirty-four million, six hundred eighty-one thousand, fifty-one".