81202243 has 2 divisors, whose sum is σ = 81202244. Its totient is φ = 81202242.

The previous prime is 81202171. The next prime is 81202301. The reversal of 81202243 is 34220218.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81202243 is a prime.

It is not a weakly prime, because it can be changed into another prime (81202543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40601121 + 40601122.

It is an arithmetic number, because the mean of its divisors is an integer number (40601122).

Almost surely, 2^81202243 is an apocalyptic number.

81202243 is a deficient number, since it is larger than the sum of its proper divisors (1).

81202243 is an equidigital number, since it uses as much as digits as its factorization.

81202243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 81202243 is about 9011.2287175501. The cubic root of 81202243 is about 433.0346765907.

The spelling of 81202243 in words is "eighty-one million, two hundred two thousand, two hundred forty-three".