87091061 has 2 divisors, whose sum is σ = 87091062. Its totient is φ = 87091060.

The previous prime is 87091019. The next prime is 87091097. The reversal of 87091061 is 16019078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 2910436 = 9175^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 87091061 - 2²² = 82896757 is a prime.

It is a super-2 number, since 2×87091061² = 15169705812211442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87091261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43545530 + 43545531.

It is an arithmetic number, because the mean of its divisors is an integer number (43545531).

Almost surely, 2^87091061 is an apocalyptic number.

It is an amenable number.

87091061 is a deficient number, since it is larger than the sum of its proper divisors (1).

87091061 is an equidigital number, since it uses as much as digits as its factorization.

87091061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 87091061 is about 9332.2591584246. The cubic root of 87091061 is about 443.2593042891.

The spelling of 87091061 in words is "eighty-seven million, ninety-one thousand, sixty-one".