81601863 has 8 divisors (see below), whose sum is σ = 124345728. Its totient is φ = 46629624.

The previous prime is 81601847. The next prime is 81601867. The reversal of 81601863 is 36810618.

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

It is not a de Polignac number, because 81601863 - 2⁴ = 81601847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81601867) 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, 1942881 + ... + 1942922.

It is an arithmetic number, because the mean of its divisors is an integer number (15543216).

Almost surely, 2^81601863 is an apocalyptic number.

81601863 is a deficient number, since it is larger than the sum of its proper divisors (42743865).

81601863 is a wasteful number, since it uses less digits than its factorization.

81601863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885813.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81601863 is about 9033.3749507036. The cubic root of 81601863 is about 433.7438779183.

The spelling of 81601863 in words is "eighty-one million, six hundred one thousand, eight hundred sixty-three".