81324403 has 2 divisors, whose sum is σ = 81324404. Its totient is φ = 81324402.

The previous prime is 81324319. The next prime is 81324431. The reversal of 81324403 is 30442318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81324403 - 2²¹ = 79227251 is a prime.

It is a super-2 number, since 2×81324403² = 13227317046612818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81324473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40662201 + 40662202.

It is an arithmetic number, because the mean of its divisors is an integer number (40662202).

Almost surely, 2^81324403 is an apocalyptic number.

81324403 is a deficient number, since it is larger than the sum of its proper divisors (1).

81324403 is an equidigital number, since it uses as much as digits as its factorization.

81324403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81324403 is about 9018.0043801276. The cubic root of 81324403 is about 433.2517190807.

The spelling of 81324403 in words is "eighty-one million, three hundred twenty-four thousand, four hundred three".