81013301 has 2 divisors, whose sum is σ = 81013302. Its totient is φ = 81013300.

The previous prime is 81013297. The next prime is 81013319. The reversal of 81013301 is 10331018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75603025 + 5410276 = 8695^2 + 2326^2 .

It is a cyclic number.

It is not a de Polignac number, because 81013301 - 2² = 81013297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81013301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81013351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40506650 + 40506651.

It is an arithmetic number, because the mean of its divisors is an integer number (40506651).

Almost surely, 2^81013301 is an apocalyptic number.

It is an amenable number.

81013301 is a deficient number, since it is larger than the sum of its proper divisors (1).

81013301 is an equidigital number, since it uses as much as digits as its factorization.

81013301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 81013301 is about 9000.7389141114. The cubic root of 81013301 is about 432.6985529584.

Adding to 81013301 its reverse (10331018), we get a palindrome (91344319).

The spelling of 81013301 in words is "eighty-one million, thirteen thousand, three hundred one".