45431181 has 18 divisors (see below), whose sum is σ = 66382862. Its totient is φ = 29939760.

The previous prime is 45431179. The next prime is 45431189. The reversal of 45431181 is 18113454.

It is a happy number.

45431181 is a `hidden beast` number, since 4 + 543 + 118 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 20331081 = 5010^2 + 4509^2 .

It is not a de Polignac number, because 45431181 - 2¹ = 45431179 is a prime.

It is a super-2 number, since 2×45431181² = 4127984414109522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45431189) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 250911 + ... + 251091.

Almost surely, 2^45431181 is an apocalyptic number.

It is an amenable number.

45431181 is a deficient number, since it is larger than the sum of its proper divisors (20951681).

45431181 is a wasteful number, since it uses less digits than its factorization.

45431181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 351 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 45431181 is about 6740.2656475839. The cubic root of 45431181 is about 356.8217691888.

The spelling of 45431181 in words is "forty-five million, four hundred thirty-one thousand, one hundred eighty-one".