641181013 has 4 divisors (see below), whose sum is σ = 699470208. Its totient is φ = 582891820.

The previous prime is 641180999. The next prime is 641181053. The reversal of 641181013 is 310181146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641181013 is a prime.

It is a super-2 number, since 2×641181013² = 822226182863412338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641181053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29144581 + ... + 29144602.

It is an arithmetic number, because the mean of its divisors is an integer number (174867552).

Almost surely, 2^641181013 is an apocalyptic number.

It is an amenable number.

641181013 is a deficient number, since it is larger than the sum of its proper divisors (58289195).

641181013 is a wasteful number, since it uses less digits than its factorization.

641181013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58289194.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 641181013 is about 25321.5523418293. The cubic root of 641181013 is about 862.3036368214.

The spelling of 641181013 in words is "six hundred forty-one million, one hundred eighty-one thousand, thirteen".