81700343 has 2 divisors, whose sum is σ = 81700344. Its totient is φ = 81700342.

The previous prime is 81700291. The next prime is 81700369. The reversal of 81700343 is 34300718.

It is an a-pointer prime, because the next prime (81700369) can be obtained adding 81700343 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81700343 - 2¹² = 81696247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81700543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40850171 + 40850172.

It is an arithmetic number, because the mean of its divisors is an integer number (40850172).

Almost surely, 2^81700343 is an apocalyptic number.

81700343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81700343 is an equidigital number, since it uses as much as digits as its factorization.

81700343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 81700343 is about 9038.8242045080. The cubic root of 81700343 is about 433.9182935655.

The spelling of 81700343 in words is "eighty-one million, seven hundred thousand, three hundred forty-three".