745042591 has 4 divisors (see below), whose sum is σ = 746022384. Its totient is φ = 744062800.

The previous prime is 745042549. The next prime is 745042603. The reversal of 745042591 is 195240547.

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 745042591 - 2²⁵ = 711488159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 745042591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745042511) 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, 488755 + ... + 490276.

It is an arithmetic number, because the mean of its divisors is an integer number (186505596).

Almost surely, 2^745042591 is an apocalyptic number.

745042591 is a deficient number, since it is larger than the sum of its proper divisors (979793).

745042591 is an equidigital number, since it uses as much as digits as its factorization.

745042591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979792.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 745042591 is about 27295.4683235148. The cubic root of 745042591 is about 906.5540451022.

The spelling of 745042591 in words is "seven hundred forty-five million, forty-two thousand, five hundred ninety-one".