45181691 has 4 divisors (see below), whose sum is σ = 46232472. Its totient is φ = 44130912.

The previous prime is 45181679. The next prime is 45181751. The reversal of 45181691 is 19618154.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19618154 = 2 ⋅9809077.

It is a cyclic number.

It is not a de Polignac number, because 45181691 - 2⁶ = 45181627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45181991) 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, 525326 + ... + 525411.

It is an arithmetic number, because the mean of its divisors is an integer number (11558118).

Almost surely, 2^45181691 is an apocalyptic number.

45181691 is a deficient number, since it is larger than the sum of its proper divisors (1050781).

45181691 is a wasteful number, since it uses less digits than its factorization.

45181691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050780.

The product of its digits is 8640, while the sum is 35.

The square root of 45181691 is about 6721.7327379181. The cubic root of 45181691 is about 356.1673953958.

The spelling of 45181691 in words is "forty-five million, one hundred eighty-one thousand, six hundred ninety-one".