745445861 has 4 divisors (see below), whose sum is σ = 745761324. Its totient is φ = 745130400.

The previous prime is 745445849. The next prime is 745445927. The reversal of 745445861 is 168544547.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26884225 + 718561636 = 5185^2 + 26806^2 .

It is a cyclic number.

It is not a de Polignac number, because 745445861 - 2⁶ = 745445797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745445761) 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, 154160 + ... + 158921.

It is an arithmetic number, because the mean of its divisors is an integer number (186440331).

Almost surely, 2^745445861 is an apocalyptic number.

It is an amenable number.

745445861 is a deficient number, since it is larger than the sum of its proper divisors (315463).

745445861 is a wasteful number, since it uses less digits than its factorization.

745445861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315462.

The product of its digits is 537600, while the sum is 44.

The square root of 745445861 is about 27302.8544478412. The cubic root of 745445861 is about 906.7175794261.

The spelling of 745445861 in words is "seven hundred forty-five million, four hundred forty-five thousand, eight hundred sixty-one".