91288130 has 16 divisors (see below), whose sum is σ = 173984760. Its totient is φ = 34367232.

The previous prime is 91288129. The next prime is 91288133. The reversal of 91288130 is 3188219.

It can be written as a sum of positive squares in 4 ways, for example, as 59737441 + 31550689 = 7729^2 + 5617^2 .

It is not an unprimeable number, because it can be changed into a prime (91288133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268325 + ... + 268664.

Almost surely, 2^91288130 is an apocalyptic number.

91288130 is a deficient number, since it is larger than the sum of its proper divisors (82696630).

91288130 is a wasteful number, since it uses less digits than its factorization.

91288130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537013.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 91288130 is about 9554.4821942374. The cubic root of 91288130 is about 450.2683666712.

The spelling of 91288130 in words is "ninety-one million, two hundred eighty-eight thousand, one hundred thirty".