629164561 has 4 divisors (see below), whose sum is σ = 649460224. Its totient is φ = 608868900.

The previous prime is 629164489. The next prime is 629164567. The reversal of 629164561 is 165461926.

It is a happy number.

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 not a de Polignac number, because 629164561 - 2¹³ = 629156369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (629164567) 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, 10147785 + ... + 10147846.

It is an arithmetic number, because the mean of its divisors is an integer number (162365056).

Almost surely, 2^629164561 is an apocalyptic number.

It is an amenable number.

629164561 is a deficient number, since it is larger than the sum of its proper divisors (20295663).

629164561 is a wasteful number, since it uses less digits than its factorization.

629164561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20295662.

The product of its digits is 77760, while the sum is 40.

The square root of 629164561 is about 25083.1529317987. The cubic root of 629164561 is about 856.8827840904.

The spelling of 629164561 in words is "six hundred twenty-nine million, one hundred sixty-four thousand, five hundred sixty-one".