91259873 has 2 divisors, whose sum is σ = 91259874. Its totient is φ = 91259872.

The previous prime is 91259827. The next prime is 91259879. The reversal of 91259873 is 37895219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91259809 + 64 = 9553^2 + 8^2 .

It is an emirp because it is prime and its reverse (37895219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91259873 - 2⁸ = 91259617 is a prime.

It is a super-2 number, since 2×91259873² = 16656728839952258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91259879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45629936 + 45629937.

It is an arithmetic number, because the mean of its divisors is an integer number (45629937).

Almost surely, 2^91259873 is an apocalyptic number.

It is an amenable number.

91259873 is a deficient number, since it is larger than the sum of its proper divisors (1).

91259873 is an equidigital number, since it uses as much as digits as its factorization.

91259873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 91259873 is about 9553.0033497325. The cubic root of 91259873 is about 450.2219037257.

The spelling of 91259873 in words is "ninety-one million, two hundred fifty-nine thousand, eight hundred seventy-three".