81733441 has 2 divisors, whose sum is σ = 81733442. Its totient is φ = 81733440.

The previous prime is 81733439. The next prime is 81733451. The reversal of 81733441 is 14433718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77510416 + 4223025 = 8804^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 81733441 - 2¹ = 81733439 is a prime.

Together with 81733439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81733451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866720 + 40866721.

It is an arithmetic number, because the mean of its divisors is an integer number (40866721).

Almost surely, 2^81733441 is an apocalyptic number.

It is an amenable number.

81733441 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733441 is an equidigital number, since it uses as much as digits as its factorization.

81733441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 81733441 is about 9040.6548988444. The cubic root of 81733441 is about 433.9768811968.

The spelling of 81733441 in words is "eighty-one million, seven hundred thirty-three thousand, four hundred forty-one".