634121845 has 32 divisors (see below), whose sum is σ = 960864768. Its totient is φ = 391446528.

The previous prime is 634121837. The next prime is 634121863. The reversal of 634121845 is 548121436.

It is a cyclic number.

It is not a de Polignac number, because 634121845 - 2³ = 634121837 is a prime.

It is a super-2 number, since 2×634121845² = 804221028612408050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634121845.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9484 + ... + 36853.

It is an arithmetic number, because the mean of its divisors is an integer number (30027024).

Almost surely, 2^634121845 is an apocalyptic number.

It is an amenable number.

634121845 is a deficient number, since it is larger than the sum of its proper divisors (326742923).

634121845 is a wasteful number, since it uses less digits than its factorization.

634121845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46389.

The product of its digits is 23040, while the sum is 34.

The square root of 634121845 is about 25181.7760493576. The cubic root of 634121845 is about 859.1274027336.

The spelling of 634121845 in words is "six hundred thirty-four million, one hundred twenty-one thousand, eight hundred forty-five".