91198253 has 4 divisors (see below), whose sum is σ = 92101308. Its totient is φ = 90295200.

The previous prime is 91198207. The next prime is 91198259. The reversal of 91198253 is 35289119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35289119 = 2243 ⋅15733.

It can be written as a sum of positive squares in 2 ways, for example, as 60871204 + 30327049 = 7802^2 + 5507^2 .

It is a cyclic number.

It is not a de Polignac number, because 91198253 - 2¹⁰ = 91197229 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 (91198259) 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, 451376 + ... + 451577.

It is an arithmetic number, because the mean of its divisors is an integer number (23025327).

Almost surely, 2^91198253 is an apocalyptic number.

It is an amenable number.

91198253 is a deficient number, since it is larger than the sum of its proper divisors (903055).

91198253 is a wasteful number, since it uses less digits than its factorization.

91198253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903054.

The product of its digits is 19440, while the sum is 38.

The square root of 91198253 is about 9549.7776413904. Note that the first 3 decimals coincide. The cubic root of 91198253 is about 450.1205487737.

The spelling of 91198253 in words is "ninety-one million, one hundred ninety-eight thousand, two hundred fifty-three".