91671751 has 16 divisors (see below), whose sum is σ = 98425600. Its totient is φ = 85131648.

The previous prime is 91671739. The next prime is 91671763. The reversal of 91671751 is 15717619.

It is an interprime number because it is at equal distance from previous prime (91671739) and next prime (91671763).

It is a cyclic number.

It is not a de Polignac number, because 91671751 - 2⁷ = 91671623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91671751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91671731) 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, 271855 + ... + 272191.

It is an arithmetic number, because the mean of its divisors is an integer number (6151600).

Almost surely, 2^91671751 is an apocalyptic number.

91671751 is a deficient number, since it is larger than the sum of its proper divisors (6753849).

91671751 is a wasteful number, since it uses less digits than its factorization.

91671751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 13230, while the sum is 37.

The square root of 91671751 is about 9574.5365945303. The cubic root of 91671751 is about 450.8982076156.

The spelling of 91671751 in words is "ninety-one million, six hundred seventy-one thousand, seven hundred fifty-one".