45191987 has 16 divisors (see below), whose sum is σ = 48584448. Its totient is φ = 41939040.

The previous prime is 45191959. The next prime is 45191989. The reversal of 45191987 is 78919154.

45191987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 45191987 - 2¹⁶ = 45126451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45191989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159548 + ... + 159830.

It is an arithmetic number, because the mean of its divisors is an integer number (3036528).

Almost surely, 2^45191987 is an apocalyptic number.

45191987 is a deficient number, since it is larger than the sum of its proper divisors (3392461).

45191987 is a wasteful number, since it uses less digits than its factorization.

45191987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its digits is 90720, while the sum is 44.

The square root of 45191987 is about 6722.4985682408. The cubic root of 45191987 is about 356.1944478065.

The spelling of 45191987 in words is "forty-five million, one hundred ninety-one thousand, nine hundred eighty-seven".