87091261 has 2 divisors, whose sum is σ = 87091262. Its totient is φ = 87091260.

The previous prime is 87091253. The next prime is 87091267. The reversal of 87091261 is 16219078.

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., 49084036 + 38007225 = 7006^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 87091261 - 2³ = 87091253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87091267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43545630 + 43545631.

It is an arithmetic number, because the mean of its divisors is an integer number (43545631).

Almost surely, 2^87091261 is an apocalyptic number.

It is an amenable number.

87091261 is a deficient number, since it is larger than the sum of its proper divisors (1).

87091261 is an equidigital number, since it uses as much as digits as its factorization.

87091261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 87091261 is about 9332.2698739374. The cubic root of 87091261 is about 443.2596435960.

The spelling of 87091261 in words is "eighty-seven million, ninety-one thousand, two hundred sixty-one".