87277189 has 2 divisors, whose sum is σ = 87277190. Its totient is φ = 87277188.

The previous prime is 87277139. The next prime is 87277213. The reversal of 87277189 is 98177278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 4225 = 9342^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 87277189 - 2⁹ = 87276677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87277129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43638594 + 43638595.

It is an arithmetic number, because the mean of its divisors is an integer number (43638595).

Almost surely, 2^87277189 is an apocalyptic number.

It is an amenable number.

87277189 is a deficient number, since it is larger than the sum of its proper divisors (1).

87277189 is an equidigital number, since it uses as much as digits as its factorization.

87277189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 49.

The square root of 87277189 is about 9342.2261265718. The cubic root of 87277189 is about 443.5748524153.

The spelling of 87277189 in words is "eighty-seven million, two hundred seventy-seven thousand, one hundred eighty-nine".