91217135 has 4 divisors (see below), whose sum is σ = 109460568. Its totient is φ = 72973704.

The previous prime is 91217131. The next prime is 91217141. The reversal of 91217135 is 53171219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91217135 - 2² = 91217131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91217098 and 91217107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91217131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9121709 + ... + 9121718.

It is an arithmetic number, because the mean of its divisors is an integer number (27365142).

Almost surely, 2^91217135 is an apocalyptic number.

91217135 is a deficient number, since it is larger than the sum of its proper divisors (18243433).

91217135 is a wasteful number, since it uses less digits than its factorization.

91217135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18243432.

The product of its digits is 1890, while the sum is 29.

The square root of 91217135 is about 9550.7661996303. The cubic root of 91217135 is about 450.1516114656.

The spelling of 91217135 in words is "ninety-one million, two hundred seventeen thousand, one hundred thirty-five".