749561 has 4 divisors (see below), whose sum is σ = 753012. Its totient is φ = 746112.

The previous prime is 749557. The next prime is 749587. The reversal of 749561 is 165947.

It is a happy number.

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 430336 + 319225 = 656^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 749561 - 2² = 749557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (749461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (188253).

2⁷⁴⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

749561 is a deficient number, since it is larger than the sum of its proper divisors (3451).

749561 is a wasteful number, since it uses less digits than its factorization.

749561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3450.

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

The square root of 749561 is about 865.7719099162. The cubic root of 749561 is about 90.8382991608.

The spelling of 749561 in words is "seven hundred forty-nine thousand, five hundred sixty-one".