641144015 has 16 divisors (see below), whose sum is σ = 797195520. Its totient is φ = 494492160.

The previous prime is 641144011. The next prime is 641144027. The reversal of 641144015 is 510441146.

It is not a de Polignac number, because 641144015 - 2² = 641144011 is a prime.

It is a super-2 number, since 2×641144015² = 822131295940640450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641144011) 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, 34007 + ... + 49383.

It is an arithmetic number, because the mean of its divisors is an integer number (49824720).

Almost surely, 2^641144015 is an apocalyptic number.

641144015 is a deficient number, since it is larger than the sum of its proper divisors (156051505).

641144015 is a wasteful number, since it uses less digits than its factorization.

641144015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15682.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 641144015 is about 25320.8217678653. The cubic root of 641144015 is about 862.2870506972.

The spelling of 641144015 in words is "six hundred forty-one million, one hundred forty-four thousand, fifteen".