641234731 has 2 divisors, whose sum is σ = 641234732. Its totient is φ = 641234730.

The previous prime is 641234723. The next prime is 641234749. The reversal of 641234731 is 137432146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641234731 - 2³ = 641234723 is a prime.

It is a super-2 number, since 2×641234731² = 822363960481284722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641234693 and 641234702.

It is not a weakly prime, because it can be changed into another prime (641237731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320617365 + 320617366.

It is an arithmetic number, because the mean of its divisors is an integer number (320617366).

Almost surely, 2^641234731 is an apocalyptic number.

641234731 is a deficient number, since it is larger than the sum of its proper divisors (1).

641234731 is an equidigital number, since it uses as much as digits as its factorization.

641234731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 641234731 is about 25322.6130365727. The cubic root of 641234731 is about 862.3277173500.

Adding to 641234731 its reverse (137432146), we get a palindrome (778666877).

The spelling of 641234731 in words is "six hundred forty-one million, two hundred thirty-four thousand, seven hundred thirty-one".