85015261 has 4 divisors (see below), whose sum is σ = 85150624. Its totient is φ = 84879900.

The previous prime is 85015247. The next prime is 85015277. The reversal of 85015261 is 16251058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16251058 = 2 ⋅8125529.

It is a cyclic number.

It is not a de Polignac number, because 85015261 - 2⁹ = 85014749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85015661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66735 + ... + 67996.

It is an arithmetic number, because the mean of its divisors is an integer number (21287656).

Almost surely, 2^85015261 is an apocalyptic number.

It is an amenable number.

85015261 is a deficient number, since it is larger than the sum of its proper divisors (135363).

85015261 is a wasteful number, since it uses less digits than its factorization.

85015261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135362.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 85015261 is about 9220.3720640764. The cubic root of 85015261 is about 439.7092793736.

The spelling of 85015261 in words is "eighty-five million, fifteen thousand, two hundred sixty-one".