745291 has 4 divisors (see below), whose sum is σ = 765472. Its totient is φ = 725112.

The previous prime is 745273. The next prime is 745301. The reversal of 745291 is 192547.

It is a happy number.

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 745291 - 2¹⁷ = 614219 is a prime.

It is a super-3 number, since 3×745291³ = 1241935053335031513, which contains 333 as substring.

It is a Duffinian number.

745291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (745201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10035 + ... + 10108.

It is an arithmetic number, because the mean of its divisors is an integer number (191368).

2⁷⁴⁵²⁹¹ is an apocalyptic number.

745291 is a deficient number, since it is larger than the sum of its proper divisors (20181).

745291 is a wasteful number, since it uses less digits than its factorization.

745291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20180.

The product of its digits is 2520, while the sum is 28.

The square root of 745291 is about 863.3023803975. The cubic root of 745291 is about 90.6654787066.

The spelling of 745291 in words is "seven hundred forty-five thousand, two hundred ninety-one".