633420199129 has 3 divisors (see below), whose sum is σ = 633420995007. Its totient is φ = 633419403252.

The previous prime is 633420199127. The next prime is 633420199183. The reversal of 633420199129 is 921991024336.

The square root of 633420199129 is 795877.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 416960775625 + 216459423504 = 645725^2 + 465252^2 .

It is not a de Polignac number, because 633420199129 - 2¹ = 633420199127 is a prime.

It is a super-2 number, since 2×633420199129² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (633420199127) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 397939 + ... + 1193815.

It is an arithmetic number, because the mean of its divisors is an integer number (211140331669).

Almost surely, 2^633420199129 is an apocalyptic number.

633420199129 is the 795877-th square number.

633420199129 is the 397939-th centered octagonal number.

It is an amenable number.

633420199129 is a deficient number, since it is larger than the sum of its proper divisors (795878).

633420199129 is an frugal number, since it uses more digits than its factorization.

633420199129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591754 (or 795877 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 49.

Multiplying 633420199129 by its sum of digits (49), we get a square (31037589757321 = 5571139²).

The spelling of 633420199129 in words is "six hundred thirty-three billion, four hundred twenty million, one hundred ninety-nine thousand, one hundred twenty-nine".