641136129 has 4 divisors (see below), whose sum is σ = 854848176. Its totient is φ = 427424084.

The previous prime is 641136127. The next prime is 641136131. The reversal of 641136129 is 921631146.

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 an interprime number because it is at equal distance from previous prime (641136127) and next prime (641136131).

It is a cyclic number.

It is not a de Polignac number, because 641136129 - 2¹ = 641136127 is a prime.

It is a super-2 number, since 2×641136129² = 822111071818209282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641136129.

It is not an unprimeable number, because it can be changed into a prime (641136127) 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, 106856019 + ... + 106856024.

It is an arithmetic number, because the mean of its divisors is an integer number (213712044).

Almost surely, 2^641136129 is an apocalyptic number.

It is an amenable number.

641136129 is a deficient number, since it is larger than the sum of its proper divisors (213712047).

641136129 is a wasteful number, since it uses less digits than its factorization.

641136129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213712046.

The product of its digits is 7776, while the sum is 33.

The square root of 641136129 is about 25320.6660457422. Note that the first 3 decimals coincide. The cubic root of 641136129 is about 862.2835153378.

The spelling of 641136129 in words is "six hundred forty-one million, one hundred thirty-six thousand, one hundred twenty-nine".