87188369 has 2 divisors, whose sum is σ = 87188370. Its totient is φ = 87188368.

The previous prime is 87188347. The next prime is 87188389. The reversal of 87188369 is 96388178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47334400 + 39853969 = 6880^2 + 6313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87188369 is a prime.

It is a super-2 number, since 2×87188369² = 15203623377760322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87188389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43594184 + 43594185.

It is an arithmetic number, because the mean of its divisors is an integer number (43594185).

Almost surely, 2^87188369 is an apocalyptic number.

It is an amenable number.

87188369 is a deficient number, since it is larger than the sum of its proper divisors (1).

87188369 is an equidigital number, since it uses as much as digits as its factorization.

87188369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 87188369 is about 9337.4712315487. The cubic root of 87188369 is about 443.4243293469.

The spelling of 87188369 in words is "eighty-seven million, one hundred eighty-eight thousand, three hundred sixty-nine".