91273949 has 4 divisors (see below), whose sum is σ = 98295036. Its totient is φ = 84252864.

The previous prime is 91273943. The next prime is 91273957. The reversal of 91273949 is 94937219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38812900 + 52461049 = 6230^2 + 7243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91273949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91273943) 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, 3510524 + ... + 3510549.

It is an arithmetic number, because the mean of its divisors is an integer number (24573759).

Almost surely, 2^91273949 is an apocalyptic number.

It is an amenable number.

91273949 is a deficient number, since it is larger than the sum of its proper divisors (7021087).

91273949 is a wasteful number, since it uses less digits than its factorization.

91273949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021086.

The product of its digits is 122472, while the sum is 44.

The square root of 91273949 is about 9553.7400529845. The cubic root of 91273949 is about 450.2450500715.

The spelling of 91273949 in words is "ninety-one million, two hundred seventy-three thousand, nine hundred forty-nine".