745561 has 8 divisors (see below), whose sum is σ = 789120. Its totient is φ = 703248.

The previous prime is 745543. The next prime is 745567. The reversal of 745561 is 165547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745561 - 2⁵ = 745529 is a prime.

It is a super-2 number, since 2×745561² = 1111722409442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1090 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (98640).

2⁷⁴⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

745561 is a deficient number, since it is larger than the sum of its proper divisors (43559).

745561 is a wasteful number, since it uses less digits than its factorization.

745561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its digits is 4200, while the sum is 28.

The square root of 745561 is about 863.4587425002. The cubic root of 745561 is about 90.6764259847.

The spelling of 745561 in words is "seven hundred forty-five thousand, five hundred sixty-one".