45518491 has 4 divisors (see below), whose sum is σ = 45535000. Its totient is φ = 45501984.

The previous prime is 45518489. The next prime is 45518507. The reversal of 45518491 is 19481554.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19481554 = 2 ⋅9740777.

It is a cyclic number.

It is not a de Polignac number, because 45518491 - 2¹ = 45518489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45518491.

It is not an unprimeable number, because it can be changed into a prime (45518411) 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, 3006 + ... + 10003.

It is an arithmetic number, because the mean of its divisors is an integer number (11383750).

Almost surely, 2^45518491 is an apocalyptic number.

45518491 is a deficient number, since it is larger than the sum of its proper divisors (16509).

45518491 is a wasteful number, since it uses less digits than its factorization.

45518491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16508.

The product of its digits is 28800, while the sum is 37.

The square root of 45518491 is about 6746.7392864998. The cubic root of 45518491 is about 357.0502038737.

The spelling of 45518491 in words is "forty-five million, five hundred eighteen thousand, four hundred ninety-one".