641434949 has 4 divisors (see below), whose sum is σ = 642966240. Its totient is φ = 639903660.

The previous prime is 641434943. The next prime is 641434979. The reversal of 641434949 is 949434146.

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, and also an emirpimes, since its reverse is a distinct semiprime: 949434146 = 2 ⋅474717073.

It is a cyclic number.

It is not a de Polignac number, because 641434949 - 2⁸ = 641434693 is a prime.

It is a super-2 number, since 2×641434949² = 822877587597265202, 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 (641434943) 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, 765017 + ... + 765854.

It is an arithmetic number, because the mean of its divisors is an integer number (160741560).

Almost surely, 2^641434949 is an apocalyptic number.

It is an amenable number.

641434949 is a deficient number, since it is larger than the sum of its proper divisors (1531291).

641434949 is a wasteful number, since it uses less digits than its factorization.

641434949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531290.

The product of its digits is 373248, while the sum is 44.

The square root of 641434949 is about 25326.5660720122. The cubic root of 641434949 is about 862.4174585716.

The spelling of 641434949 in words is "six hundred forty-one million, four hundred thirty-four thousand, nine hundred forty-nine".