91047985 has 16 divisors (see below), whose sum is σ = 127771776. Its totient is φ = 60979968.

The previous prime is 91047973. The next prime is 91048021. The reversal of 91047985 is 58974019.

It is not a de Polignac number, because 91047985 - 2⁷ = 91047857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian 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, 28744 + ... + 31753.

It is an arithmetic number, because the mean of its divisors is an integer number (7985736).

Almost surely, 2^91047985 is an apocalyptic number.

It is an amenable number.

91047985 is a deficient number, since it is larger than the sum of its proper divisors (36723791).

91047985 is a wasteful number, since it uses less digits than its factorization.

91047985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60552.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 91047985 is about 9541.9067800938. The cubic root of 91047985 is about 449.8731906061.

The spelling of 91047985 in words is "ninety-one million, forty-seven thousand, nine hundred eighty-five".