81143245 has 8 divisors (see below), whose sum is σ = 97862400. Its totient is φ = 64587600.

The previous prime is 81143219. The next prime is 81143267. The reversal of 81143245 is 54234118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-81143245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39781 + ... + 41770.

It is an arithmetic number, because the mean of its divisors is an integer number (12232800).

Almost surely, 2^81143245 is an apocalyptic number.

It is an amenable number.

81143245 is a deficient number, since it is larger than the sum of its proper divisors (16719155).

81143245 is a wasteful number, since it uses less digits than its factorization.

81143245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81755.

The product of its digits is 3840, while the sum is 28.

The square root of 81143245 is about 9007.9545402938. The cubic root of 81143245 is about 432.9297764927.

The spelling of 81143245 in words is "eighty-one million, one hundred forty-three thousand, two hundred forty-five".