45309865 has 4 divisors (see below), whose sum is σ = 54371844. Its totient is φ = 36247888.

The previous prime is 45309853. The next prime is 45309907. The reversal of 45309865 is 56890354.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56890354 = 2 ⋅28445177.

It can be written as a sum of positive squares in 2 ways, for example, as 19289664 + 26020201 = 4392^2 + 5101^2 .

It is a cyclic number.

It is not a de Polignac number, because 45309865 - 2¹¹ = 45307817 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4530982 + ... + 4530991.

It is an arithmetic number, because the mean of its divisors is an integer number (13592961).

Almost surely, 2^45309865 is an apocalyptic number.

It is an amenable number.

45309865 is a deficient number, since it is larger than the sum of its proper divisors (9061979).

45309865 is an equidigital number, since it uses as much as digits as its factorization.

45309865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9061978.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 45309865 is about 6731.2602831862. The cubic root of 45309865 is about 356.5038760793.

The spelling of 45309865 in words is "forty-five million, three hundred nine thousand, eight hundred sixty-five".