91872273 has 4 divisors (see below), whose sum is σ = 122496368. Its totient is φ = 61248180.

The previous prime is 91872269. The next prime is 91872293. The reversal of 91872273 is 37227819.

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 not a de Polignac number, because 91872273 - 2² = 91872269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91872293) 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, 15312043 + ... + 15312048.

It is an arithmetic number, because the mean of its divisors is an integer number (30624092).

Almost surely, 2^91872273 is an apocalyptic number.

It is an amenable number.

91872273 is a deficient number, since it is larger than the sum of its proper divisors (30624095).

91872273 is a wasteful number, since it uses less digits than its factorization.

91872273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30624094.

The product of its digits is 42336, while the sum is 39.

The square root of 91872273 is about 9585.0025039120. The cubic root of 91872273 is about 451.2267318159.

The spelling of 91872273 in words is "ninety-one million, eight hundred seventy-two thousand, two hundred seventy-three".