623131641 has 24 divisors (see below), whose sum is σ = 987607296. Its totient is φ = 375462240.

The previous prime is 623131637. The next prime is 623131661. The reversal of 623131641 is 146131326.

623131641 is a `hidden beast` number, since 6 + 2 + 3 + 13 + 1 + 641 = 666.

It is not a de Polignac number, because 623131641 - 2² = 623131637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623131601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1065 + ... + 35318.

It is an arithmetic number, because the mean of its divisors is an integer number (41150304).

Almost surely, 2^623131641 is an apocalyptic number.

It is an amenable number.

623131641 is a deficient number, since it is larger than the sum of its proper divisors (364475655).

623131641 is a wasteful number, since it uses less digits than its factorization.

623131641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36573 (or 36570 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 623131641 is about 24962.6048520582. The cubic root of 623131641 is about 854.1351632635.

Adding to 623131641 its reverse (146131326), we get a palindrome (769262967).

The spelling of 623131641 in words is "six hundred twenty-three million, one hundred thirty-one thousand, six hundred forty-one".