91136109 has 4 divisors (see below), whose sum is σ = 121514816. Its totient is φ = 60757404.

The previous prime is 91136107. The next prime is 91136117. The reversal of 91136109 is 90163119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91136109 - 2¹ = 91136107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91136107) 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, 15189349 + ... + 15189354.

It is an arithmetic number, because the mean of its divisors is an integer number (30378704).

Almost surely, 2^91136109 is an apocalyptic number.

It is an amenable number.

91136109 is a deficient number, since it is larger than the sum of its proper divisors (30378707).

91136109 is a wasteful number, since it uses less digits than its factorization.

91136109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30378706.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 91136109 is about 9546.5233985991. The cubic root of 91136109 is about 450.0182856767.

The spelling of 91136109 in words is "ninety-one million, one hundred thirty-six thousand, one hundred nine".