81073801 has 2 divisors, whose sum is σ = 81073802. Its totient is φ = 81073800.

The previous prime is 81073789. The next prime is 81073807. The reversal of 81073801 is 10837018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44156025 + 36917776 = 6645^2 + 6076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81073801 is a prime.

It is a super-2 number, since 2×81073801² = 13145922417175202, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81073801.

It is not a weakly prime, because it can be changed into another prime (81073807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40536900 + 40536901.

It is an arithmetic number, because the mean of its divisors is an integer number (40536901).

Almost surely, 2^81073801 is an apocalyptic number.

It is an amenable number.

81073801 is a deficient number, since it is larger than the sum of its proper divisors (1).

81073801 is an equidigital number, since it uses as much as digits as its factorization.

81073801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81073801 is about 9004.0991220666. The cubic root of 81073801 is about 432.8062379446.

The spelling of 81073801 in words is "eighty-one million, seventy-three thousand, eight hundred one".