91973161 has 4 divisors (see below), whose sum is σ = 105112192. Its totient is φ = 78834132.

The previous prime is 91973137. The next prime is 91973171. The reversal of 91973161 is 16137919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91973161 - 2⁷ = 91973033 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 91973161.

It is not an unprimeable number, because it can be changed into a prime (91973131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6569505 + ... + 6569518.

It is an arithmetic number, because the mean of its divisors is an integer number (26278048).

Almost surely, 2^91973161 is an apocalyptic number.

It is an amenable number.

91973161 is a deficient number, since it is larger than the sum of its proper divisors (13139031).

91973161 is a wasteful number, since it uses less digits than its factorization.

91973161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13139030.

The product of its digits is 10206, while the sum is 37.

The square root of 91973161 is about 9590.2638649831. The cubic root of 91973161 is about 451.3918404231.

The spelling of 91973161 in words is "ninety-one million, nine hundred seventy-three thousand, one hundred sixty-one".