91851851 has 8 divisors (see below), whose sum is σ = 113048544. Its totient is φ = 72673920.

The previous prime is 91851821. The next prime is 91851869. The reversal of 91851851 is 15815819.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91851851 - 2¹⁰ = 91850827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91851821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504590 + ... + 504771.

It is an arithmetic number, because the mean of its divisors is an integer number (14131068).

Almost surely, 2^91851851 is an apocalyptic number.

91851851 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91851851 is a deficient number, since it is larger than the sum of its proper divisors (21196693).

91851851 is a wasteful number, since it uses less digits than its factorization.

91851851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009381.

The product of its digits is 14400, while the sum is 38.

The square root of 91851851 is about 9583.9371346018. The cubic root of 91851851 is about 451.1932954123.

The spelling of 91851851 in words is "ninety-one million, eight hundred fifty-one thousand, eight hundred fifty-one".