81874523 has 2 divisors, whose sum is σ = 81874524. Its totient is φ = 81874522.

The previous prime is 81874519. The next prime is 81874531. The reversal of 81874523 is 32547818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81874523 - 2² = 81874519 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (81874543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40937261 + 40937262.

It is an arithmetic number, because the mean of its divisors is an integer number (40937262).

Almost surely, 2^81874523 is an apocalyptic number.

81874523 is a deficient number, since it is larger than the sum of its proper divisors (1).

81874523 is an equidigital number, since it uses as much as digits as its factorization.

81874523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 81874523 is about 9048.4541773720. The cubic root of 81874523 is about 434.2264368715.

The spelling of 81874523 in words is "eighty-one million, eight hundred seventy-four thousand, five hundred twenty-three".