641154523 has 2 divisors, whose sum is σ = 641154524. Its totient is φ = 641154522.

The previous prime is 641154419. The next prime is 641154539. The reversal of 641154523 is 325451146.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641154523 is a prime.

It is a super-2 number, since 2×641154523² = 822158244726715058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641154223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320577261 + 320577262.

It is an arithmetic number, because the mean of its divisors is an integer number (320577262).

Almost surely, 2^641154523 is an apocalyptic number.

641154523 is a deficient number, since it is larger than the sum of its proper divisors (1).

641154523 is an equidigital number, since it uses as much as digits as its factorization.

641154523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 641154523 is about 25321.0292642302. The cubic root of 641154523 is about 862.2917614760.

The spelling of 641154523 in words is "six hundred forty-one million, one hundred fifty-four thousand, five hundred twenty-three".