2591864405 has 16 divisors (see below), whose sum is σ = 3431184624. Its totient is φ = 1867307520.

The previous prime is 2591864371. The next prime is 2591864417. The reversal of 2591864405 is 5044681952.

It can be written as a sum of positive squares in 8 ways, for example, as 78446449 + 2513417956 = 8857^2 + 50134^2 .

It is not a de Polignac number, because 2591864405 - 2¹⁰ = 2591863381 is a prime.

It is a super-2 number, since 2×2591864405² = 13435522187812008050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483614 + ... + 488943.

It is an arithmetic number, because the mean of its divisors is an integer number (214449039).

Almost surely, 2^2591864405 is an apocalyptic number.

It is an amenable number.

2591864405 is a deficient number, since it is larger than the sum of its proper divisors (839320219).

2591864405 is a wasteful number, since it uses less digits than its factorization.

2591864405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972616.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 2591864405 is about 50910.3565593485. The cubic root of 2591864405 is about 1373.6331373241.

The spelling of 2591864405 in words is "two billion, five hundred ninety-one million, eight hundred sixty-four thousand, four hundred five".