641136490 has 8 divisors (see below), whose sum is σ = 1154045700. Its totient is φ = 256454592.

The previous prime is 641136473. The next prime is 641136497. The reversal of 641136490 is 94631146.

It can be written as a sum of positive squares in 2 ways, for example, as 578931721 + 62204769 = 24061^2 + 7887^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×641136490² = 822111997619040200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641136497) 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, 32056815 + ... + 32056834.

Almost surely, 2^641136490 is an apocalyptic number.

641136490 is a deficient number, since it is larger than the sum of its proper divisors (512909210).

641136490 is a wasteful number, since it uses less digits than its factorization.

641136490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64113656.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 641136490 is about 25320.6731743056. The cubic root of 641136490 is about 862.2836771778.

The spelling of 641136490 in words is "six hundred forty-one million, one hundred thirty-six thousand, four hundred ninety".