641242487 has 2 divisors, whose sum is σ = 641242488. Its totient is φ = 641242486.

The previous prime is 641242453. The next prime is 641242541. The reversal of 641242487 is 784242146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641242487 - 2¹⁶ = 641176951 is a prime.

It is a super-2 number, since 2×641242487² = 822383854267890338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641242487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641242087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320621243 + 320621244.

It is an arithmetic number, because the mean of its divisors is an integer number (320621244).

Almost surely, 2^641242487 is an apocalyptic number.

641242487 is a deficient number, since it is larger than the sum of its proper divisors (1).

641242487 is an equidigital number, since it uses as much as digits as its factorization.

641242487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 38.

The square root of 641242487 is about 25322.7661798627. The cubic root of 641242487 is about 862.3311940731.

The spelling of 641242487 in words is "six hundred forty-one million, two hundred forty-two thousand, four hundred eighty-seven".