91920011 has 4 divisors (see below), whose sum is σ = 92001024. Its totient is φ = 91839000.

The previous prime is 91919977. The next prime is 91920019. The reversal of 91920011 is 11002919.

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 91920011 - 2¹⁰ = 91918987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91920019) 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, 38780 + ... + 41081.

It is an arithmetic number, because the mean of its divisors is an integer number (23000256).

Almost surely, 2^91920011 is an apocalyptic number.

91920011 is a deficient number, since it is larger than the sum of its proper divisors (81013).

91920011 is a wasteful number, since it uses less digits than its factorization.

91920011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81012.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 91920011 is about 9587.4924250296. The cubic root of 91920011 is about 451.3048726635.

The spelling of 91920011 in words is "ninety-one million, nine hundred twenty thousand, eleven".