641092145 has 4 divisors (see below), whose sum is σ = 769310580. Its totient is φ = 512873712.

The previous prime is 641092139. The next prime is 641092159. The reversal of 641092145 is 541290146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 508773136 + 132319009 = 22556^2 + 11503^2 .

It is a cyclic number.

It is not a de Polignac number, because 641092145 - 2²⁸ = 372656689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64109210 + ... + 64109219.

It is an arithmetic number, because the mean of its divisors is an integer number (192327645).

Almost surely, 2^641092145 is an apocalyptic number.

It is an amenable number.

641092145 is a deficient number, since it is larger than the sum of its proper divisors (128218435).

641092145 is a wasteful number, since it uses less digits than its factorization.

641092145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128218434.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 641092145 is about 25319.7974912913. The cubic root of 641092145 is about 862.2637964130.

The spelling of 641092145 in words is "six hundred forty-one million, ninety-two thousand, one hundred forty-five".