45187381 has 4 divisors (see below), whose sum is σ = 45317952. Its totient is φ = 45056812.

The previous prime is 45187357. The next prime is 45187391. The reversal of 45187381 is 18378154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18378154 = 2 ⋅9189077.

It is a cyclic number.

It is not a de Polignac number, because 45187381 - 2⁷ = 45187253 is a prime.

It is a super-2 number, since 2×45187381² = 4083798803278322, which contains 22 as substring.

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 45187381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45187391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64765 + ... + 65458.

It is an arithmetic number, because the mean of its divisors is an integer number (11329488).

Almost surely, 2^45187381 is an apocalyptic number.

It is an amenable number.

45187381 is a deficient number, since it is larger than the sum of its proper divisors (130571).

45187381 is a wasteful number, since it uses less digits than its factorization.

45187381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130570.

The product of its digits is 26880, while the sum is 37.

The square root of 45187381 is about 6722.1559785533. The cubic root of 45187381 is about 356.1823461968.

The spelling of 45187381 in words is "forty-five million, one hundred eighty-seven thousand, three hundred eighty-one".