81972043 has 8 divisors (see below), whose sum is σ = 82667520. Its totient is φ = 81279720.

The previous prime is 81972041. The next prime is 81972047. The reversal of 81972043 is 34027918.

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

It is a cyclic number.

It is not a de Polignac number, because 81972043 - 2¹ = 81972041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81972041) 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, 88738 + ... + 89656.

It is an arithmetic number, because the mean of its divisors is an integer number (10333440).

Almost surely, 2^81972043 is an apocalyptic number.

81972043 is a deficient number, since it is larger than the sum of its proper divisors (695477).

81972043 is a wasteful number, since it uses less digits than its factorization.

81972043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 81972043 is about 9053.8413394537. The cubic root of 81972043 is about 434.3987695220.

The spelling of 81972043 in words is "eighty-one million, nine hundred seventy-two thousand, forty-three".