2591026387 has 4 divisors (see below), whose sum is σ = 2646154656. Its totient is φ = 2535898120.

The previous prime is 2591026379. The next prime is 2591026433. The reversal of 2591026387 is 7836201952.

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 2591026387 - 2³ = 2591026379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2591026327) 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, 27564064 + ... + 27564157.

It is an arithmetic number, because the mean of its divisors is an integer number (661538664).

Almost surely, 2^2591026387 is an apocalyptic number.

2591026387 is a deficient number, since it is larger than the sum of its proper divisors (55128269).

2591026387 is an equidigital number, since it uses as much as digits as its factorization.

2591026387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55128268.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 2591026387 is about 50902.1255646559. The cubic root of 2591026387 is about 1373.4850774464.

The spelling of 2591026387 in words is "two billion, five hundred ninety-one million, twenty-six thousand, three hundred eighty-seven".