91126993 has 2 divisors, whose sum is σ = 91126994. Its totient is φ = 91126992.

The previous prime is 91126991. The next prime is 91127017. The reversal of 91126993 is 39962119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53758224 + 37368769 = 7332^2 + 6113^2 .

It is an emirp because it is prime and its reverse (39962119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91126993 - 2¹ = 91126991 is a prime.

Together with 91126991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91126991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45563496 + 45563497.

It is an arithmetic number, because the mean of its divisors is an integer number (45563497).

Almost surely, 2^91126993 is an apocalyptic number.

It is an amenable number.

91126993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91126993 is an equidigital number, since it uses as much as digits as its factorization.

91126993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 40.

The square root of 91126993 is about 9546.0459353598. The cubic root of 91126993 is about 450.0032806345.

The spelling of 91126993 in words is "ninety-one million, one hundred twenty-six thousand, nine hundred ninety-three".