45691645 has 4 divisors (see below), whose sum is σ = 54829980. Its totient is φ = 36553312.

The previous prime is 45691627. The next prime is 45691687. The reversal of 45691645 is 54619654.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54619654 = 2 ⋅27309827.

It can be written as a sum of positive squares in 2 ways, for example, as 17665209 + 28026436 = 4203^2 + 5294^2 .

It is a cyclic number.

It is not a de Polignac number, because 45691645 - 2¹³ = 45683453 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 junction number, because it is equal to n+sod(n) for n = 45691598 and 45691607.

It is a congruent 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, 4569160 + ... + 4569169.

It is an arithmetic number, because the mean of its divisors is an integer number (13707495).

Almost surely, 2^45691645 is an apocalyptic number.

It is an amenable number.

45691645 is a deficient number, since it is larger than the sum of its proper divisors (9138335).

45691645 is an equidigital number, since it uses as much as digits as its factorization.

45691645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138334.

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

The square root of 45691645 is about 6759.5595270698. The cubic root of 45691645 is about 357.5023749985.

The spelling of 45691645 in words is "forty-five million, six hundred ninety-one thousand, six hundred forty-five".