87912149 has 4 divisors (see below), whose sum is σ = 94674636. Its totient is φ = 81149664.

The previous prime is 87912133. The next prime is 87912157. The reversal of 87912149 is 94121978.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4774225 + 83137924 = 2185^2 + 9118^2 .

It is a cyclic number.

It is not a de Polignac number, because 87912149 - 2⁴ = 87912133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87912109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381224 + ... + 3381249.

It is an arithmetic number, because the mean of its divisors is an integer number (23668659).

Almost surely, 2^87912149 is an apocalyptic number.

It is an amenable number.

87912149 is a deficient number, since it is larger than the sum of its proper divisors (6762487).

87912149 is a wasteful number, since it uses less digits than its factorization.

87912149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762486.

The product of its digits is 36288, while the sum is 41.

The square root of 87912149 is about 9376.1478763936. The cubic root of 87912149 is about 444.6479545328.

The spelling of 87912149 in words is "eighty-seven million, nine hundred twelve thousand, one hundred forty-nine".