87931549 has 2 divisors, whose sum is σ = 87931550. Its totient is φ = 87931548.

The previous prime is 87931483. The next prime is 87931559. The reversal of 87931549 is 94513978.

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., 80192025 + 7739524 = 8955^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 87931549 - 2⁷ = 87931421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87931499 and 87931508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87931559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43965774 + 43965775.

It is an arithmetic number, because the mean of its divisors is an integer number (43965775).

Almost surely, 2^87931549 is an apocalyptic number.

It is an amenable number.

87931549 is a deficient number, since it is larger than the sum of its proper divisors (1).

87931549 is an equidigital number, since it uses as much as digits as its factorization.

87931549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 87931549 is about 9377.1823593231. The cubic root of 87931549 is about 444.6806596669.

The spelling of 87931549 in words is "eighty-seven million, nine hundred thirty-one thousand, five hundred forty-nine".