1002664591 has 4 divisors (see below), whose sum is σ = 1029763672. Its totient is φ = 975565512.

The previous prime is 1002664571. The next prime is 1002664601. The reversal of 1002664591 is 1954662001.

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

It is a cyclic number.

It is not a de Polignac number, because 1002664591 - 2⁷ = 1002664463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002664541) 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, 13549485 + ... + 13549558.

It is an arithmetic number, because the mean of its divisors is an integer number (257440918).

Almost surely, 2^1002664591 is an apocalyptic number.

1002664591 is a deficient number, since it is larger than the sum of its proper divisors (27099081).

1002664591 is an equidigital number, since it uses as much as digits as its factorization.

1002664591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27099080.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1002664591 is about 31664.8794565841. The cubic root of 1002664591 is about 1000.8874092718.

The spelling of 1002664591 in words is "one billion, two million, six hundred sixty-four thousand, five hundred ninety-one".