641161445 has 4 divisors (see below), whose sum is σ = 769393740. Its totient is φ = 512929152.

The previous prime is 641161439. The next prime is 641161457. The reversal of 641161445 is 544161146.

641161445 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 258019969 + 383141476 = 16063^2 + 19574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641161445 is a prime.

It is a super-2 number, since 2×641161445² = 822175997108976050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64116140 + ... + 64116149.

It is an arithmetic number, because the mean of its divisors is an integer number (192348435).

Almost surely, 2^641161445 is an apocalyptic number.

It is an amenable number.

641161445 is a deficient number, since it is larger than the sum of its proper divisors (128232295).

641161445 is a wasteful number, since it uses less digits than its factorization.

641161445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128232294.

The product of its digits is 11520, while the sum is 32.

The square root of 641161445 is about 25321.1659486683. The cubic root of 641161445 is about 862.2948646084.

The spelling of 641161445 in words is "six hundred forty-one million, one hundred sixty-one thousand, four hundred forty-five".