81374851 has 8 divisors (see below), whose sum is σ = 85188384. Its totient is φ = 77584320.

The previous prime is 81374833. The next prime is 81374863. The reversal of 81374851 is 15847318.

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 81374851 - 2¹¹ = 81372803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81374851.

It is not an unprimeable number, because it can be changed into a prime (81374831) 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, 1711 + ... + 12871.

It is an arithmetic number, because the mean of its divisors is an integer number (10648548).

Almost surely, 2^81374851 is an apocalyptic number.

81374851 is a deficient number, since it is larger than the sum of its proper divisors (3813533).

81374851 is a wasteful number, since it uses less digits than its factorization.

81374851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11501.

The product of its digits is 26880, while the sum is 37.

The square root of 81374851 is about 9020.8010176480. The cubic root of 81374851 is about 433.3412869678.

The spelling of 81374851 in words is "eighty-one million, three hundred seventy-four thousand, eight hundred fifty-one".