91124939 has 2 divisors, whose sum is σ = 91124940. Its totient is φ = 91124938.

The previous prime is 91124923. The next prime is 91124941. The reversal of 91124939 is 93942119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91124939 - 2⁴ = 91124923 is a prime.

Together with 91124941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91124959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45562469 + 45562470.

It is an arithmetic number, because the mean of its divisors is an integer number (45562470).

Almost surely, 2^91124939 is an apocalyptic number.

91124939 is a deficient number, since it is larger than the sum of its proper divisors (1).

91124939 is an equidigital number, since it uses as much as digits as its factorization.

91124939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 91124939 is about 9545.9383509428. The cubic root of 91124939 is about 449.9998995885. Note that the first 3 decimals are identical.

The spelling of 91124939 in words is "ninety-one million, one hundred twenty-four thousand, nine hundred thirty-nine".