81124863 has 8 divisors (see below), whose sum is σ = 109536000. Its totient is φ = 53398488.

The previous prime is 81124859. The next prime is 81124891. The reversal of 81124863 is 36842118.

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

It is not a de Polignac number, because 81124863 - 2² = 81124859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81124843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170913 + ... + 171386.

It is an arithmetic number, because the mean of its divisors is an integer number (13692000).

Almost surely, 2^81124863 is an apocalyptic number.

81124863 is a deficient number, since it is larger than the sum of its proper divisors (28411137).

81124863 is a wasteful number, since it uses less digits than its factorization.

81124863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342381.

The product of its digits is 9216, while the sum is 33.

The square root of 81124863 is about 9006.9341620776. The cubic root of 81124863 is about 432.8970823925.

The spelling of 81124863 in words is "eighty-one million, one hundred twenty-four thousand, eight hundred sixty-three".