91851243 has 8 divisors (see below), whose sum is σ = 133601856. Its totient is φ = 55667400.

The previous prime is 91851223. The next prime is 91851251. The reversal of 91851243 is 34215819.

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

It is not a de Polignac number, because 91851243 - 2⁵ = 91851211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2783371 = 91851243 / (9 + 1 + 8 + 5 + 1 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (91851223) 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, 1391653 + ... + 1391718.

It is an arithmetic number, because the mean of its divisors is an integer number (16700232).

Almost surely, 2^91851243 is an apocalyptic number.

91851243 is a deficient number, since it is larger than the sum of its proper divisors (41750613).

91851243 is a wasteful number, since it uses less digits than its factorization.

91851243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783385.

The product of its digits is 8640, while the sum is 33.

The square root of 91851243 is about 9583.9054148087. The cubic root of 91851243 is about 451.1922998739.

The spelling of 91851243 in words is "ninety-one million, eight hundred fifty-one thousand, two hundred forty-three".