1391042589 has 4 divisors (see below), whose sum is σ = 1854723456. Its totient is φ = 927361724.

The previous prime is 1391042581. The next prime is 1391042591. The reversal of 1391042589 is 9852401931.

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 1391042589 - 2³ = 1391042581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391042589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391042581) 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, 231840429 + ... + 231840434.

It is an arithmetic number, because the mean of its divisors is an integer number (463680864).

Almost surely, 2^1391042589 is an apocalyptic number.

It is an amenable number.

1391042589 is a deficient number, since it is larger than the sum of its proper divisors (463680867).

1391042589 is an equidigital number, since it uses as much as digits as its factorization.

1391042589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463680866.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1391042589 is about 37296.6833512043. The cubic root of 1391042589 is about 1116.2979887635.

The spelling of 1391042589 in words is "one billion, three hundred ninety-one million, forty-two thousand, five hundred eighty-nine".