91138253 has 4 divisors (see below), whose sum is σ = 91392480. Its totient is φ = 90884028.

The previous prime is 91138181. The next prime is 91138261. The reversal of 91138253 is 35283119.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35283119 = 4177 ⋅8447.

It is a cyclic number.

It is not a de Polignac number, because 91138253 - 2¹⁴ = 91121869 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 (91132253) 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, 126575 + ... + 127292.

It is an arithmetic number, because the mean of its divisors is an integer number (22848120).

Almost surely, 2^91138253 is an apocalyptic number.

It is an amenable number.

91138253 is a deficient number, since it is larger than the sum of its proper divisors (254227).

91138253 is a wasteful number, since it uses less digits than its factorization.

91138253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254226.

The product of its digits is 6480, while the sum is 32.

The square root of 91138253 is about 9546.6356901267. The cubic root of 91138253 is about 450.0218145803.

The spelling of 91138253 in words is "ninety-one million, one hundred thirty-eight thousand, two hundred fifty-three".