641630131 has 4 divisors (see below), whose sum is σ = 643119264. Its totient is φ = 640141000.

The previous prime is 641630117. The next prime is 641630161. The reversal of 641630131 is 131036146.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 641630131 - 2⁹ = 641629619 is a prime.

It is a super-2 number, since 2×641630131² = 823378450014154322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641630096 and 641630105.

It is not an unprimeable number, because it can be changed into a prime (641630161) 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, 743920 + ... + 744781.

It is an arithmetic number, because the mean of its divisors is an integer number (160779816).

Almost surely, 2^641630131 is an apocalyptic number.

641630131 is a deficient number, since it is larger than the sum of its proper divisors (1489133).

641630131 is a wasteful number, since it uses less digits than its factorization.

641630131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489132.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 641630131 is about 25330.4190845710. The cubic root of 641630131 is about 862.5049245956.

Adding to 641630131 its reverse (131036146), we get a palindrome (772666277).

The spelling of 641630131 in words is "six hundred forty-one million, six hundred thirty thousand, one hundred thirty-one".