81074423 has 2 divisors, whose sum is σ = 81074424. Its totient is φ = 81074422.

The previous prime is 81074419. The next prime is 81074431. The reversal of 81074423 is 32447018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81074423 - 2² = 81074419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81074453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537211 + 40537212.

It is an arithmetic number, because the mean of its divisors is an integer number (40537212).

Almost surely, 2^81074423 is an apocalyptic number.

81074423 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074423 is an equidigital number, since it uses as much as digits as its factorization.

81074423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 81074423 is about 9004.1336618244. The cubic root of 81074423 is about 432.8073447748.

The spelling of 81074423 in words is "eighty-one million, seventy-four thousand, four hundred twenty-three".