634181429261 has 4 divisors (see below), whose sum is σ = 634185665952. Its totient is φ = 634177192572.

The previous prime is 634181429239. The next prime is 634181429267. The reversal of 634181429261 is 162924181436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634181429261 is a prime.

It is a super-2 number, since 2×634181429261² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634181429267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885265 + ... + 2196038.

It is an arithmetic number, because the mean of its divisors is an integer number (158546416488).

Almost surely, 2^634181429261 is an apocalyptic number.

It is an amenable number.

634181429261 is a deficient number, since it is larger than the sum of its proper divisors (4236691).

634181429261 is a wasteful number, since it uses less digits than its factorization.

634181429261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236690.

The product of its digits is 497664, while the sum is 47.

The spelling of 634181429261 in words is "six hundred thirty-four billion, one hundred eighty-one million, four hundred twenty-nine thousand, two hundred sixty-one".