81013371 has 4 divisors (see below), whose sum is σ = 108017832. Its totient is φ = 54008912.

The previous prime is 81013369. The next prime is 81013391. The reversal of 81013371 is 17331018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81013371 - 2¹ = 81013369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81013301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13502226 + ... + 13502231.

It is an arithmetic number, because the mean of its divisors is an integer number (27004458).

Almost surely, 2^81013371 is an apocalyptic number.

81013371 is a deficient number, since it is larger than the sum of its proper divisors (27004461).

81013371 is a wasteful number, since it uses less digits than its factorization.

81013371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27004460.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 81013371 is about 9000.7428026802. The cubic root of 81013371 is about 432.6986775836.

Adding to 81013371 its reverse (17331018), we get a palindrome (98344389).

The spelling of 81013371 in words is "eighty-one million, thirteen thousand, three hundred seventy-one".