641601623 has 16 divisors (see below), whose sum is σ = 711970560. Its totient is φ = 574489344.

The previous prime is 641601619. The next prime is 641601643. The reversal of 641601623 is 326106146.

It is a happy number.

It is not a de Polignac number, because 641601623 - 2² = 641601619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641601643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56090 + ... + 66552.

It is an arithmetic number, because the mean of its divisors is an integer number (44498160).

Almost surely, 2^641601623 is an apocalyptic number.

641601623 is a deficient number, since it is larger than the sum of its proper divisors (70368937).

641601623 is a wasteful number, since it uses less digits than its factorization.

641601623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10618.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 641601623 is about 25329.8563556922. The cubic root of 641601623 is about 862.4921505412.

Adding to 641601623 its reverse (326106146), we get a palindrome (967707769).

The spelling of 641601623 in words is "six hundred forty-one million, six hundred one thousand, six hundred twenty-three".