87237121 has 2 divisors, whose sum is σ = 87237122. Its totient is φ = 87237120.

The previous prime is 87237119. The next prime is 87237173. The reversal of 87237121 is 12173278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87235600 + 1521 = 9340^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 87237121 - 2¹ = 87237119 is a prime.

It is a super-2 number, since 2×87237121² = 15220630560737282, which contains 22 as substring.

Together with 87237119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87237181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43618560 + 43618561.

It is an arithmetic number, because the mean of its divisors is an integer number (43618561).

Almost surely, 2^87237121 is an apocalyptic number.

It is an amenable number.

87237121 is a deficient number, since it is larger than the sum of its proper divisors (1).

87237121 is an equidigital number, since it uses as much as digits as its factorization.

87237121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 87237121 is about 9340.0814236280. The cubic root of 87237121 is about 443.5069619088.

The spelling of 87237121 in words is "eighty-seven million, two hundred thirty-seven thousand, one hundred twenty-one".