91749651 has 16 divisors (see below), whose sum is σ = 147168000. Its totient is φ = 49668768.

The previous prime is 91749643. The next prime is 91749653. The reversal of 91749651 is 15694719.

It is not a de Polignac number, because 91749651 - 2³ = 91749643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91749653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114576 + ... + 115373.

It is an arithmetic number, because the mean of its divisors is an integer number (9198000).

Almost surely, 2^91749651 is an apocalyptic number.

91749651 is a deficient number, since it is larger than the sum of its proper divisors (55418349).

91749651 is a wasteful number, since it uses less digits than its factorization.

91749651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229978.

The product of its digits is 68040, while the sum is 42.

The square root of 91749651 is about 9578.6038126650. The cubic root of 91749651 is about 451.0258915360.

The spelling of 91749651 in words is "ninety-one million, seven hundred forty-nine thousand, six hundred fifty-one".