87121369 has 2 divisors, whose sum is σ = 87121370. Its totient is φ = 87121368.

The previous prime is 87121367. The next prime is 87121387. The reversal of 87121369 is 96312178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46416969 + 40704400 = 6813^2 + 6380^2 .

It is a cyclic number.

It is not a de Polignac number, because 87121369 - 2¹ = 87121367 is a prime.

It is a super-2 number, since 2×87121369² = 15180265872868322, which contains 22 as substring.

Together with 87121367, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87121367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43560684 + 43560685.

It is an arithmetic number, because the mean of its divisors is an integer number (43560685).

Almost surely, 2^87121369 is an apocalyptic number.

It is an amenable number.

87121369 is a deficient number, since it is larger than the sum of its proper divisors (1).

87121369 is an equidigital number, since it uses as much as digits as its factorization.

87121369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 87121369 is about 9333.8828469185. The cubic root of 87121369 is about 443.3107169322.

The spelling of 87121369 in words is "eighty-seven million, one hundred twenty-one thousand, three hundred sixty-nine".