91521754 has 8 divisors (see below), whose sum is σ = 138285108. Its totient is φ = 45426720.

The previous prime is 91521743. The next prime is 91521797. The reversal of 91521754 is 45712519.

It can be written as a sum of positive squares in 2 ways, for example, as 91298025 + 223729 = 9555^2 + 473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166737 + ... + 167284.

Almost surely, 2^91521754 is an apocalyptic number.

91521754 is a deficient number, since it is larger than the sum of its proper divisors (46763354).

91521754 is a wasteful number, since it uses less digits than its factorization.

91521754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334160.

The product of its digits is 12600, while the sum is 34.

The square root of 91521754 is about 9566.7002670722. The cubic root of 91521754 is about 450.6521474447.

The spelling of 91521754 in words is "ninety-one million, five hundred twenty-one thousand, seven hundred fifty-four".