641156287 has 2 divisors, whose sum is σ = 641156288. Its totient is φ = 641156286.

The previous prime is 641156233. The next prime is 641156293. The reversal of 641156287 is 782651146.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641156287 is a prime.

It is a super-2 number, since 2×641156287² = 822162768719252738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641156227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320578143 + 320578144.

It is an arithmetic number, because the mean of its divisors is an integer number (320578144).

Almost surely, 2^641156287 is an apocalyptic number.

641156287 is a deficient number, since it is larger than the sum of its proper divisors (1).

641156287 is an equidigital number, since it uses as much as digits as its factorization.

641156287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 641156287 is about 25321.0640969135. The cubic root of 641156287 is about 862.2925522793.

The spelling of 641156287 in words is "six hundred forty-one million, one hundred fifty-six thousand, two hundred eighty-seven".