91069091 has 4 divisors (see below), whose sum is σ = 91920312. Its totient is φ = 90217872.

The previous prime is 91069081. The next prime is 91069093. The reversal of 91069091 is 19096019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19096019 = 137 ⋅139387.

It is a cyclic number.

It is not a de Polignac number, because 91069091 - 2¹⁴ = 91052707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91069093) 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, 425450 + ... + 425663.

It is an arithmetic number, because the mean of its divisors is an integer number (22980078).

Almost surely, 2^91069091 is an apocalyptic number.

91069091 is a deficient number, since it is larger than the sum of its proper divisors (851221).

91069091 is a wasteful number, since it uses less digits than its factorization.

91069091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851220.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 91069091 is about 9543.0126794425. The cubic root of 91069091 is about 449.9079498962.

The spelling of 91069091 in words is "ninety-one million, sixty-nine thousand, ninety-one".