91906253 has 2 divisors, whose sum is σ = 91906254. Its totient is φ = 91906252.

The previous prime is 91906223. The next prime is 91906277. The reversal of 91906253 is 35260919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81685444 + 10220809 = 9038^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 91906253 - 2⁸ = 91905997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91906223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45953126 + 45953127.

It is an arithmetic number, because the mean of its divisors is an integer number (45953127).

Almost surely, 2^91906253 is an apocalyptic number.

It is an amenable number.

91906253 is a deficient number, since it is larger than the sum of its proper divisors (1).

91906253 is an equidigital number, since it uses as much as digits as its factorization.

91906253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 91906253 is about 9586.7749008726. The cubic root of 91906253 is about 451.2823553967.

The spelling of 91906253 in words is "ninety-one million, nine hundred six thousand, two hundred fifty-three".