81202543 has 2 divisors, whose sum is σ = 81202544. Its totient is φ = 81202542.

The previous prime is 81202507. The next prime is 81202579. The reversal of 81202543 is 34520218.

It is a balanced prime because it is at equal distance from previous prime (81202507) and next prime (81202579).

It is a cyclic number.

It is not a de Polignac number, because 81202543 - 2⁹ = 81202031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81202243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40601271 + 40601272.

It is an arithmetic number, because the mean of its divisors is an integer number (40601272).

Almost surely, 2^81202543 is an apocalyptic number.

81202543 is a deficient number, since it is larger than the sum of its proper divisors (1).

81202543 is an equidigital number, since it uses as much as digits as its factorization.

81202543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 81202543 is about 9011.2453634334. The cubic root of 81202543 is about 433.0352098693.

The spelling of 81202543 in words is "eighty-one million, two hundred two thousand, five hundred forty-three".