91917253 has 2 divisors, whose sum is σ = 91917254. Its totient is φ = 91917252.

The previous prime is 91917227. The next prime is 91917277. The reversal of 91917253 is 35271919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60186564 + 31730689 = 7758^2 + 5633^2 .

It is an emirp because it is prime and its reverse (35271919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91917253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91987253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45958626 + 45958627.

It is an arithmetic number, because the mean of its divisors is an integer number (45958627).

Almost surely, 2^91917253 is an apocalyptic number.

It is an amenable number.

91917253 is a deficient number, since it is larger than the sum of its proper divisors (1).

91917253 is an equidigital number, since it uses as much as digits as its factorization.

91917253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 37.

The square root of 91917253 is about 9587.3485907210. The cubic root of 91917253 is about 451.3003589156.

The spelling of 91917253 in words is "ninety-one million, nine hundred seventeen thousand, two hundred fifty-three".