81872303 has 2 divisors, whose sum is σ = 81872304. Its totient is φ = 81872302.

The previous prime is 81872269. The next prime is 81872321. The reversal of 81872303 is 30327818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81872303 - 2¹⁸ = 81610159 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81872303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81872363) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40936151 + 40936152.

It is an arithmetic number, because the mean of its divisors is an integer number (40936152).

Almost surely, 2^81872303 is an apocalyptic number.

81872303 is a deficient number, since it is larger than the sum of its proper divisors (1).

81872303 is an equidigital number, since it uses as much as digits as its factorization.

81872303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 81872303 is about 9048.3315036530. The cubic root of 81872303 is about 434.2225122017. Note that the first 3 decimals are identical.

The spelling of 81872303 in words is "eighty-one million, eight hundred seventy-two thousand, three hundred three".