91851011 has 4 divisors (see below), whose sum is σ = 104972592. Its totient is φ = 78729432.

The previous prime is 91851007. The next prime is 91851077. The reversal of 91851011 is 11015819.

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 91851011 - 2² = 91851007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91851211) 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, 6560780 + ... + 6560793.

It is an arithmetic number, because the mean of its divisors is an integer number (26243148).

Almost surely, 2^91851011 is an apocalyptic number.

91851011 is a deficient number, since it is larger than the sum of its proper divisors (13121581).

91851011 is a wasteful number, since it uses less digits than its factorization.

91851011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13121580.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 91851011 is about 9583.8933111758. The cubic root of 91851011 is about 451.1919199963.

The spelling of 91851011 in words is "ninety-one million, eight hundred fifty-one thousand, eleven".