634381011 has 32 divisors (see below), whose sum is σ = 1027146240. Its totient is φ = 383767200.

The previous prime is 634381001. The next prime is 634381037. The reversal of 634381011 is 110183436.

634381011 is a `hidden beast` number, since 634 + 3 + 8 + 10 + 11 = 666.

It is not a de Polignac number, because 634381011 - 2⁷ = 634380883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (634381001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192306 + ... + 195576.

It is an arithmetic number, because the mean of its divisors is an integer number (32098320).

Almost surely, 2^634381011 is an apocalyptic number.

634381011 is a deficient number, since it is larger than the sum of its proper divisors (392765229).

634381011 is a wasteful number, since it uses less digits than its factorization.

634381011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944 (or 3938 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 634381011 is about 25186.9214275981. The cubic root of 634381011 is about 859.2444287636.

The spelling of 634381011 in words is "six hundred thirty-four million, three hundred eighty-one thousand, eleven".