641166431 has 4 divisors (see below), whose sum is σ = 642426600. Its totient is φ = 639906264.

The previous prime is 641166391. The next prime is 641166437. The reversal of 641166431 is 134661146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641166431 is a prime.

It is a super-2 number, since 2×641166431² = 822188784482555522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641166437) 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, 629321 + ... + 630338.

It is an arithmetic number, because the mean of its divisors is an integer number (160606650).

Almost surely, 2^641166431 is an apocalyptic number.

641166431 is a deficient number, since it is larger than the sum of its proper divisors (1260169).

641166431 is a wasteful number, since it uses less digits than its factorization.

641166431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260168.

The product of its digits is 10368, while the sum is 32.

The square root of 641166431 is about 25321.2644036588. The cubic root of 641166431 is about 862.2970998182.

The spelling of 641166431 in words is "six hundred forty-one million, one hundred sixty-six thousand, four hundred thirty-one".