641405297 has 4 divisors (see below), whose sum is σ = 690744180. Its totient is φ = 592066416.

The previous prime is 641405279. The next prime is 641405299. The reversal of 641405297 is 792504146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 212459776 + 428945521 = 14576^2 + 20711^2 .

It is a cyclic number.

It is not a de Polignac number, because 641405297 - 2²² = 637210993 is a prime.

It is a super-2 number, since 2×641405297² = 822801510039316418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641405297.

It is not an unprimeable number, because it can be changed into a prime (641405299) 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, 24669422 + ... + 24669447.

It is an arithmetic number, because the mean of its divisors is an integer number (172686045).

Almost surely, 2^641405297 is an apocalyptic number.

It is an amenable number.

641405297 is a deficient number, since it is larger than the sum of its proper divisors (49338883).

641405297 is a wasteful number, since it uses less digits than its factorization.

641405297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49338882.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 641405297 is about 25325.9806720293. The cubic root of 641405297 is about 862.4041692030.

The spelling of 641405297 in words is "six hundred forty-one million, four hundred five thousand, two hundred ninety-seven".