81873067 has 2 divisors, whose sum is σ = 81873068. Its totient is φ = 81873066.

The previous prime is 81873059. The next prime is 81873073. The reversal of 81873067 is 76037818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81873067 - 2³ = 81873059 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81873047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40936533 + 40936534.

It is an arithmetic number, because the mean of its divisors is an integer number (40936534).

Almost surely, 2^81873067 is an apocalyptic number.

81873067 is a deficient number, since it is larger than the sum of its proper divisors (1).

81873067 is an equidigital number, since it uses as much as digits as its factorization.

81873067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81873067 is about 9048.3737212827. The cubic root of 81873067 is about 434.2238628618.

The spelling of 81873067 in words is "eighty-one million, eight hundred seventy-three thousand, sixty-seven".