91042297 has 4 divisors (see below), whose sum is σ = 91082916. Its totient is φ = 91001680.

The previous prime is 91042291. The next prime is 91042307. The reversal of 91042297 is 79224019.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79224019 = 7 ⋅11317717.

It can be written as a sum of positive squares in 2 ways, for example, as 14584761 + 76457536 = 3819^2 + 8744^2 .

It is a cyclic number.

It is not a de Polignac number, because 91042297 - 2¹⁹ = 90518009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91042291) 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, 16738 + ... + 21499.

It is an arithmetic number, because the mean of its divisors is an integer number (22770729).

Almost surely, 2^91042297 is an apocalyptic number.

It is an amenable number.

91042297 is a deficient number, since it is larger than the sum of its proper divisors (40619).

91042297 is a wasteful number, since it uses less digits than its factorization.

91042297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40618.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 91042297 is about 9541.6087218037. The cubic root of 91042297 is about 449.8638221689.

The spelling of 91042297 in words is "ninety-one million, forty-two thousand, two hundred ninety-seven".