87958121 has 4 divisors (see below), whose sum is σ = 88210500. Its totient is φ = 87705744.

The previous prime is 87958099. The next prime is 87958133. The reversal of 87958121 is 12185978.

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 81198121 + 6760000 = 9011^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 87958121 - 2¹⁰ = 87957097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87958021) 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 3 ways as a sum of consecutive naturals, for example, 125666 + ... + 126363.

It is an arithmetic number, because the mean of its divisors is an integer number (22052625).

Almost surely, 2^87958121 is an apocalyptic number.

It is an amenable number.

87958121 is a deficient number, since it is larger than the sum of its proper divisors (252379).

87958121 is a wasteful number, since it uses less digits than its factorization.

87958121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252378.

The product of its digits is 40320, while the sum is 41.

The square root of 87958121 is about 9378.5990958138. The cubic root of 87958121 is about 444.7254477799.

The spelling of 87958121 in words is "eighty-seven million, nine hundred fifty-eight thousand, one hundred twenty-one".