91487233 has 4 divisors (see below), whose sum is σ = 91616980. Its totient is φ = 91357488.

The previous prime is 91487219. The next prime is 91487237. The reversal of 91487233 is 33278419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33278419 = 59 ⋅564041.

It can be written as a sum of positive squares in 2 ways, for example, as 47238129 + 44249104 = 6873^2 + 6652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91487233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91487192 and 91487201.

It is not an unprimeable number, because it can be changed into a prime (91487237) 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, 63810 + ... + 65227.

It is an arithmetic number, because the mean of its divisors is an integer number (22904245).

Almost surely, 2^91487233 is an apocalyptic number.

It is an amenable number.

91487233 is a deficient number, since it is larger than the sum of its proper divisors (129747).

91487233 is a wasteful number, since it uses less digits than its factorization.

91487233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129746.

The product of its digits is 36288, while the sum is 37.

The square root of 91487233 is about 9564.8958697939. The cubic root of 91487233 is about 450.5954799732.

The spelling of 91487233 in words is "ninety-one million, four hundred eighty-seven thousand, two hundred thirty-three".