91290253 has 2 divisors, whose sum is σ = 91290254. Its totient is φ = 91290252.

The previous prime is 91290217. The next prime is 91290259. The reversal of 91290253 is 35209219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90878089 + 412164 = 9533^2 + 642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91290253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91290259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45645126 + 45645127.

It is an arithmetic number, because the mean of its divisors is an integer number (45645127).

Almost surely, 2^91290253 is an apocalyptic number.

It is an amenable number.

91290253 is a deficient number, since it is larger than the sum of its proper divisors (1).

91290253 is an equidigital number, since it uses as much as digits as its factorization.

91290253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 91290253 is about 9554.5932932805. The cubic root of 91290253 is about 450.2718571299.

The spelling of 91290253 in words is "ninety-one million, two hundred ninety thousand, two hundred fifty-three".