641634127 has 2 divisors, whose sum is σ = 641634128. Its totient is φ = 641634126.

The previous prime is 641634101. The next prime is 641634137. The reversal of 641634127 is 721436146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641634127 - 2²³ = 633245519 is a prime.

It is equal to p_33381277 and since 641634127 and 33381277 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 641634092 and 641634101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641634137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320817063 + 320817064.

It is an arithmetic number, because the mean of its divisors is an integer number (320817064).

Almost surely, 2^641634127 is an apocalyptic number.

641634127 is a deficient number, since it is larger than the sum of its proper divisors (1).

641634127 is an equidigital number, since it uses as much as digits as its factorization.

641634127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 641634127 is about 25330.4979619430. The cubic root of 641634127 is about 862.5067151196.

The spelling of 641634127 in words is "six hundred forty-one million, six hundred thirty-four thousand, one hundred twenty-seven".