81273403 has 2 divisors, whose sum is σ = 81273404. Its totient is φ = 81273402.

The previous prime is 81273377. The next prime is 81273407. The reversal of 81273403 is 30437218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81273403 - 2⁵ = 81273371 is a prime.

It is not a weakly prime, because it can be changed into another prime (81273407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40636701 + 40636702.

It is an arithmetic number, because the mean of its divisors is an integer number (40636702).

Almost surely, 2^81273403 is an apocalyptic number.

81273403 is a deficient number, since it is larger than the sum of its proper divisors (1).

81273403 is an equidigital number, since it uses as much as digits as its factorization.

81273403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81273403 is about 9015.1762600628. The cubic root of 81273403 is about 433.1611334862.

The spelling of 81273403 in words is "eighty-one million, two hundred seventy-three thousand, four hundred three".