91477845 has 12 divisors (see below), whose sum is σ = 158561676. Its totient is φ = 48788160.

The previous prime is 91477843. The next prime is 91477871. The reversal of 91477845 is 54877419.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20007729 + 71470116 = 4473^2 + 8454^2 .

It is not a de Polignac number, because 91477845 - 2¹ = 91477843 is a prime.

It is a super-2 number, since 2×91477845² = 16736392251688050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2032841 = 91477845 / (9 + 1 + 4 + 7 + 7 + 8 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 91477845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91477843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1016376 + ... + 1016465.

It is an arithmetic number, because the mean of its divisors is an integer number (13213473).

Almost surely, 2^91477845 is an apocalyptic number.

It is an amenable number.

91477845 is a deficient number, since it is larger than the sum of its proper divisors (67083831).

91477845 is a wasteful number, since it uses less digits than its factorization.

91477845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032852 (or 2032849 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 91477845 is about 9564.4051043439. The cubic root of 91477845 is about 450.5800667659.

The spelling of 91477845 in words is "ninety-one million, four hundred seventy-seven thousand, eight hundred forty-five".