745005491 has 4 divisors (see below), whose sum is σ = 745488000. Its totient is φ = 744522984.

The previous prime is 745005479. The next prime is 745005509. The reversal of 745005491 is 194500547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194500547 = 131 ⋅1484737.

It is a cyclic number.

It is not a de Polignac number, because 745005491 - 2²² = 740811187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745005421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238931 + ... + 242028.

It is an arithmetic number, because the mean of its divisors is an integer number (186372000).

Almost surely, 2^745005491 is an apocalyptic number.

745005491 is a deficient number, since it is larger than the sum of its proper divisors (482509).

745005491 is a wasteful number, since it uses less digits than its factorization.

745005491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482508.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 745005491 is about 27294.7887150643. The cubic root of 745005491 is about 906.5389973211.

The spelling of 745005491 in words is "seven hundred forty-five million, five thousand, four hundred ninety-one".