91809514 has 16 divisors (see below), whose sum is σ = 146062080. Its totient is φ = 43187760.

The previous prime is 91809481. The next prime is 91809527. The reversal of 91809514 is 41590819.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13554 + ... + 19165.

It is an arithmetic number, because the mean of its divisors is an integer number (9128880).

Almost surely, 2^91809514 is an apocalyptic number.

91809514 is a deficient number, since it is larger than the sum of its proper divisors (54252566).

91809514 is a wasteful number, since it uses less digits than its factorization.

91809514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 91809514 is about 9581.7281322317. The cubic root of 91809514 is about 451.1239623650.

The spelling of 91809514 in words is "ninety-one million, eight hundred nine thousand, five hundred fourteen".