641929423 has 2 divisors, whose sum is σ = 641929424. Its totient is φ = 641929422.

The previous prime is 641929411. The next prime is 641929427. The reversal of 641929423 is 324929146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641929423 - 2¹⁷ = 641798351 is a prime.

It is a super-2 number, since 2×641929423² = 824146768226225858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641929427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320964711 + 320964712.

It is an arithmetic number, because the mean of its divisors is an integer number (320964712).

Almost surely, 2^641929423 is an apocalyptic number.

641929423 is a deficient number, since it is larger than the sum of its proper divisors (1).

641929423 is an equidigital number, since it uses as much as digits as its factorization.

641929423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 641929423 is about 25336.3261543579. The cubic root of 641929423 is about 862.6390105145.

The spelling of 641929423 in words is "six hundred forty-one million, nine hundred twenty-nine thousand, four hundred twenty-three".