81672341 has 4 divisors (see below), whose sum is σ = 81698784. Its totient is φ = 81645900.

The previous prime is 81672319. The next prime is 81672359. The reversal of 81672341 is 14327618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14327618 = 2 ⋅7163809.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81672341 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81672298 and 81672307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81677341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7865 + ... + 15006.

It is an arithmetic number, because the mean of its divisors is an integer number (20424696).

Almost surely, 2^81672341 is an apocalyptic number.

It is an amenable number.

81672341 is a deficient number, since it is larger than the sum of its proper divisors (26443).

81672341 is a wasteful number, since it uses less digits than its factorization.

81672341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26442.

The product of its digits is 8064, while the sum is 32.

The square root of 81672341 is about 9037.2750871045. The cubic root of 81672341 is about 433.8687141389.

Adding to 81672341 its reverse (14327618), we get a palindrome (95999959).

The spelling of 81672341 in words is "eighty-one million, six hundred seventy-two thousand, three hundred forty-one".