91814729 has 2 divisors, whose sum is σ = 91814730. Its totient is φ = 91814728.

The previous prime is 91814719. The next prime is 91814731. The reversal of 91814729 is 92741819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73496329 + 18318400 = 8573^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 91814729 - 2⁴ = 91814713 is a prime.

It is a super-2 number, since 2×91814729² = 16859888922686882, which contains 22 as substring.

Together with 91814731, 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 (91814719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45907364 + 45907365.

It is an arithmetic number, because the mean of its divisors is an integer number (45907365).

Almost surely, 2^91814729 is an apocalyptic number.

It is an amenable number.

91814729 is a deficient number, since it is larger than the sum of its proper divisors (1).

91814729 is an equidigital number, since it uses as much as digits as its factorization.

91814729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 91814729 is about 9582.0002609059. Note that the first 3 decimals coincide. The cubic root of 91814729 is about 451.1325038433.

The spelling of 91814729 in words is "ninety-one million, eight hundred fourteen thousand, seven hundred twenty-nine".