81102338 has 4 divisors (see below), whose sum is σ = 121653510. Its totient is φ = 40551168.

The previous prime is 81102337. The next prime is 81102341. The reversal of 81102338 is 83320118.

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

It can be written as a sum of positive squares in only one way, i.e., 72709729 + 8392609 = 8527^2 + 2897^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81102337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20275583 + ... + 20275586.

Almost surely, 2^81102338 is an apocalyptic number.

81102338 is a deficient number, since it is larger than the sum of its proper divisors (40551172).

81102338 is a wasteful number, since it uses less digits than its factorization.

81102338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40551171.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81102338 is about 9005.6836497847. The cubic root of 81102338 is about 432.8570128460.

The spelling of 81102338 in words is "eighty-one million, one hundred two thousand, three hundred thirty-eight".