81846451 has 2 divisors, whose sum is σ = 81846452. Its totient is φ = 81846450.

The previous prime is 81846421. The next prime is 81846481. The reversal of 81846451 is 15464818.

It is a balanced prime because it is at equal distance from previous prime (81846421) and next prime (81846481).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81846451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81846451.

It is not a weakly prime, because it can be changed into another prime (81846421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40923225 + 40923226.

It is an arithmetic number, because the mean of its divisors is an integer number (40923226).

Almost surely, 2^81846451 is an apocalyptic number.

81846451 is a deficient number, since it is larger than the sum of its proper divisors (1).

81846451 is an equidigital number, since it uses as much as digits as its factorization.

81846451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 81846451 is about 9046.9028401990. The cubic root of 81846451 is about 434.1768040207.

The spelling of 81846451 in words is "eighty-one million, eight hundred forty-six thousand, four hundred fifty-one".