641561002 has 16 divisors (see below), whose sum is σ = 967956480. Its totient is φ = 318914992.

The previous prime is 641560993. The next prime is 641561009. The reversal of 641561002 is 200165146.

It is not an unprimeable number, because it can be changed into a prime (641561009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273828 + ... + 276160.

It is an arithmetic number, because the mean of its divisors is an integer number (60497280).

Almost surely, 2^641561002 is an apocalyptic number.

641561002 is a deficient number, since it is larger than the sum of its proper divisors (326395478).

641561002 is a wasteful number, since it uses less digits than its factorization.

641561002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 641561002 is about 25329.0545026853. The cubic root of 641561002 is about 862.4739481594.

The spelling of 641561002 in words is "six hundred forty-one million, five hundred sixty-one thousand, two".