81431207303 has 2 divisors, whose sum is σ = 81431207304. Its totient is φ = 81431207302.

The previous prime is 81431207293. The next prime is 81431207311. The reversal of 81431207303 is 30370213418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81431207303 - 2¹⁸ = 81430945159 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81431207303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81431201303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40715603651 + 40715603652.

It is an arithmetic number, because the mean of its divisors is an integer number (40715603652).

Almost surely, 2^81431207303 is an apocalyptic number.

81431207303 is a deficient number, since it is larger than the sum of its proper divisors (1).

81431207303 is an equidigital number, since it uses as much as digits as its factorization.

81431207303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 81431207303 in words is "eighty-one billion, four hundred thirty-one million, two hundred seven thousand, three hundred three".