91422118906 has 4 divisors (see below), whose sum is σ = 137133178362. Its totient is φ = 45711059452.

The previous prime is 91422118903. The next prime is 91422118919. The reversal of 91422118906 is 60981122419.

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

It can be written as a sum of positive squares in only one way, i.e., 69770467881 + 21651651025 = 264141^2 + 147145^2 .

It is not an unprimeable number, because it can be changed into a prime (91422118903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22855529725 + ... + 22855529728.

Almost surely, 2^91422118906 is an apocalyptic number.

91422118906 is a deficient number, since it is larger than the sum of its proper divisors (45711059456).

91422118906 is a wasteful number, since it uses less digits than its factorization.

91422118906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45711059455.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 91422118906 in words is "ninety-one billion, four hundred twenty-two million, one hundred eighteen thousand, nine hundred six".