91291472 has 20 divisors (see below), whose sum is σ = 177111060. Its totient is φ = 45585408.

The previous prime is 91291463. The next prime is 91291477. The reversal of 91291472 is 27419219.

It can be written as a sum of positive squares in 2 ways, for example, as 37650496 + 53640976 = 6136^2 + 7324^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91291477) 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, 10304 + ... + 16992.

It is an arithmetic number, because the mean of its divisors is an integer number (8855553).

Almost surely, 2^91291472 is an apocalyptic number.

It is an amenable number.

91291472 is a deficient number, since it is larger than the sum of its proper divisors (85819588).

91291472 is a wasteful number, since it uses less digits than its factorization.

91291472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550 (or 7544 counting only the distinct ones).

The product of its digits is 9072, while the sum is 35.

The square root of 91291472 is about 9554.6570843751. The cubic root of 91291472 is about 450.2738612831.

It can be divided in two parts, 9129 and 1472, that added together give a palindrome (10601).

The spelling of 91291472 in words is "ninety-one million, two hundred ninety-one thousand, four hundred seventy-two".