91209392093 has 4 divisors (see below), whose sum is σ = 92363941440. Its totient is φ = 90054842748.

The previous prime is 91209392077. The next prime is 91209392101. The reversal of 91209392093 is 39029390219.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39029390219 = 83591 ⋅466909.

It is a cyclic number.

It is not a de Polignac number, because 91209392093 - 2⁴ = 91209392077 is a prime.

It is a super-2 number, since 2×91209392093² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91209392063) 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, 577274555 + ... + 577274712.

It is an arithmetic number, because the mean of its divisors is an integer number (23090985360).

Almost surely, 2^91209392093 is an apocalyptic number.

It is an amenable number.

91209392093 is a deficient number, since it is larger than the sum of its proper divisors (1154549347).

91209392093 is a wasteful number, since it uses less digits than its factorization.

91209392093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154549346.

The product of its (nonzero) digits is 236196, while the sum is 47.

The spelling of 91209392093 in words is "ninety-one billion, two hundred nine million, three hundred ninety-two thousand, ninety-three".