91228759 has 2 divisors, whose sum is σ = 91228760. Its totient is φ = 91228758.

The previous prime is 91228639. The next prime is 91228763. The reversal of 91228759 is 95782219.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91228759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91228769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45614379 + 45614380.

It is an arithmetic number, because the mean of its divisors is an integer number (45614380).

Almost surely, 2^91228759 is an apocalyptic number.

91228759 is a deficient number, since it is larger than the sum of its proper divisors (1).

91228759 is an equidigital number, since it uses as much as digits as its factorization.

91228759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 91228759 is about 9551.3747178090. The cubic root of 91228759 is about 450.1707319232.

The spelling of 91228759 in words is "ninety-one million, two hundred twenty-eight thousand, seven hundred fifty-nine".