87121149 has 4 divisors (see below), whose sum is σ = 116161536. Its totient is φ = 58080764.

The previous prime is 87121147. The next prime is 87121183. The reversal of 87121149 is 94112178.

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.

It is a cyclic number.

It is not a de Polignac number, because 87121149 - 2¹ = 87121147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14520189 + ... + 14520194.

It is an arithmetic number, because the mean of its divisors is an integer number (29040384).

Almost surely, 2^87121149 is an apocalyptic number.

It is an amenable number.

87121149 is a deficient number, since it is larger than the sum of its proper divisors (29040387).

87121149 is a wasteful number, since it uses less digits than its factorization.

87121149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29040386.

The product of its digits is 4032, while the sum is 33.

The square root of 87121149 is about 9333.8710618907. The cubic root of 87121149 is about 443.3103437806.

The spelling of 87121149 in words is "eighty-seven million, one hundred twenty-one thousand, one hundred forty-nine".