91515140 has 24 divisors (see below), whose sum is σ = 194344920. Its totient is φ = 36194048.

The previous prime is 91515139. The next prime is 91515161. The reversal of 91515140 is 4151519.

It can be written as a sum of positive squares in 4 ways, for example, as 541696 + 90973444 = 736^2 + 9538^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23927 + ... + 27486.

It is an arithmetic number, because the mean of its divisors is an integer number (8097705).

Almost surely, 2^91515140 is an apocalyptic number.

It is an amenable number.

91515140 is an abundant number, since it is smaller than the sum of its proper divisors (102829780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91515140 is a wasteful number, since it uses less digits than its factorization.

91515140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51511 (or 51509 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 91515140 is about 9566.3545825983. The cubic root of 91515140 is about 450.6412914279.

Adding to 91515140 its reverse (4151519), we get a palindrome (95666659).

The spelling of 91515140 in words is "ninety-one million, five hundred fifteen thousand, one hundred forty".