640915413 has 4 divisors (see below), whose sum is σ = 854553888. Its totient is φ = 427276940.

The previous prime is 640915411. The next prime is 640915417. The reversal of 640915413 is 314519046.

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 640915413 - 2¹ = 640915411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640915411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106819233 + ... + 106819238.

It is an arithmetic number, because the mean of its divisors is an integer number (213638472).

Almost surely, 2^640915413 is an apocalyptic number.

It is an amenable number.

640915413 is a deficient number, since it is larger than the sum of its proper divisors (213638475).

640915413 is a wasteful number, since it uses less digits than its factorization.

640915413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213638474.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 640915413 is about 25316.3072544161. The cubic root of 640915413 is about 862.1845547565.

The spelling of 640915413 in words is "six hundred forty million, nine hundred fifteen thousand, four hundred thirteen".