81297038 has 4 divisors (see below), whose sum is σ = 121945560. Its totient is φ = 40648518.

The previous prime is 81297037. The next prime is 81297053. The reversal of 81297038 is 83079218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83079218 = 2 ⋅41539609.

It is a junction number, because it is equal to n+sod(n) for n = 81296992 and 81297010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81297037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20324258 + ... + 20324261.

It is an arithmetic number, because the mean of its divisors is an integer number (30486390).

Almost surely, 2^81297038 is an apocalyptic number.

81297038 is a deficient number, since it is larger than the sum of its proper divisors (40648522).

81297038 is a wasteful number, since it uses less digits than its factorization.

81297038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40648521.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 81297038 is about 9016.4870099169. The cubic root of 81297038 is about 433.2031184028.

The spelling of 81297038 in words is "eighty-one million, two hundred ninety-seven thousand, thirty-eight".