641515049 has 4 divisors (see below), whose sum is σ = 733160064. Its totient is φ = 549870036.

The previous prime is 641515037. The next prime is 641515073. The reversal of 641515049 is 940515146.

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 not a de Polignac number, because 641515049 - 2²⁴ = 624737833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641511049) 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, 45822497 + ... + 45822510.

It is an arithmetic number, because the mean of its divisors is an integer number (183290016).

Almost surely, 2^641515049 is an apocalyptic number.

It is an amenable number.

641515049 is a deficient number, since it is larger than the sum of its proper divisors (91645015).

641515049 is an equidigital number, since it uses as much as digits as its factorization.

641515049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91645014.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 641515049 is about 25328.1473661221. The cubic root of 641515049 is about 862.4533555675.

The spelling of 641515049 in words is "six hundred forty-one million, five hundred fifteen thousand, forty-nine".