91851085 has 16 divisors (see below), whose sum is σ = 117028800. Its totient is φ = 68966656.

The previous prime is 91851079. The next prime is 91851101. The reversal of 91851085 is 58015819.

It is a cyclic number.

It is not a de Polignac number, because 91851085 - 2³ = 91851077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34326 + ... + 36904.

It is an arithmetic number, because the mean of its divisors is an integer number (7314300).

Almost surely, 2^91851085 is an apocalyptic number.

It is an amenable number.

91851085 is a deficient number, since it is larger than the sum of its proper divisors (25177715).

91851085 is a wasteful number, since it uses less digits than its factorization.

91851085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 91851085 is about 9583.8971718190. The cubic root of 91851085 is about 451.1920411642.

It can be divided in two parts, 918 and 51085, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 91851085 in words is "ninety-one million, eight hundred fifty-one thousand, eighty-five".