641461657 has 2 divisors, whose sum is σ = 641461658. Its totient is φ = 641461656.

The previous prime is 641461619. The next prime is 641461693. The reversal of 641461657 is 756164146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540981081 + 100480576 = 23259^2 + 10024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641461657 is a prime.

It is a super-2 number, since 2×641461657² = 822946114802371298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641461957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320730828 + 320730829.

It is an arithmetic number, because the mean of its divisors is an integer number (320730829).

Almost surely, 2^641461657 is an apocalyptic number.

It is an amenable number.

641461657 is a deficient number, since it is larger than the sum of its proper divisors (1).

641461657 is an equidigital number, since it uses as much as digits as its factorization.

641461657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 641461657 is about 25327.0933389523. The cubic root of 641461657 is about 862.4294281542.

The spelling of 641461657 in words is "six hundred forty-one million, four hundred sixty-one thousand, six hundred fifty-seven".