745691 has 4 divisors (see below), whose sum is σ = 751272. Its totient is φ = 740112.

The previous prime is 745673. The next prime is 745697. The reversal of 745691 is 196547.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2585 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (187818).

2⁷⁴⁵⁶⁹¹ is an apocalyptic number.

745691 is a deficient number, since it is larger than the sum of its proper divisors (5581).

745691 is a wasteful number, since it uses less digits than its factorization.

745691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580.

The product of its digits is 7560, while the sum is 32.

The square root of 745691 is about 863.5340178592. The cubic root of 745691 is about 90.6816959539.

The spelling of 745691 in words is "seven hundred forty-five thousand, six hundred ninety-one".