45117987 has 4 divisors (see below), whose sum is σ = 60157320. Its totient is φ = 30078656.

The previous prime is 45117971. The next prime is 45117991. The reversal of 45117987 is 78971154.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45117987 - 2⁴ = 45117971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45117907) 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, 7519662 + ... + 7519667.

It is an arithmetic number, because the mean of its divisors is an integer number (15039330).

Almost surely, 2^45117987 is an apocalyptic number.

45117987 is a deficient number, since it is larger than the sum of its proper divisors (15039333).

45117987 is a wasteful number, since it uses less digits than its factorization.

45117987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15039332.

The product of its digits is 70560, while the sum is 42.

The square root of 45117987 is about 6716.9924073204. The cubic root of 45117987 is about 355.9999237259. Note that the first 4 decimals are identical.

The spelling of 45117987 in words is "forty-five million, one hundred seventeen thousand, nine hundred eighty-seven".