87015261 has 16 divisors (see below), whose sum is σ = 117877760. Its totient is φ = 57086640.

The previous prime is 87015259. The next prime is 87015263. The reversal of 87015261 is 16251078.

It is an interprime number because it is at equal distance from previous prime (87015259) and next prime (87015263).

It is not a de Polignac number, because 87015261 - 2¹ = 87015259 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87015263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135006 + ... + 135648.

It is an arithmetic number, because the mean of its divisors is an integer number (7367360).

Almost surely, 2^87015261 is an apocalyptic number.

It is an amenable number.

87015261 is a deficient number, since it is larger than the sum of its proper divisors (30862499).

87015261 is a wasteful number, since it uses less digits than its factorization.

87015261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 87015261 is about 9328.1970926862. The cubic root of 87015261 is about 443.1306695503.

The spelling of 87015261 in words is "eighty-seven million, fifteen thousand, two hundred sixty-one".