81547241 has 8 divisors (see below), whose sum is σ = 83504544. Its totient is φ = 79611840.

The previous prime is 81547201. The next prime is 81547243. The reversal of 81547241 is 14274518.

It is a happy number.

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 81547241 - 2⁶ = 81547177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81547198 and 81547207.

It is not an unprimeable number, because it can be changed into a prime (81547243) 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, 2186 + ... + 12956.

It is an arithmetic number, because the mean of its divisors is an integer number (10438068).

Almost surely, 2^81547241 is an apocalyptic number.

It is an amenable number.

81547241 is a deficient number, since it is larger than the sum of its proper divisors (1957303).

81547241 is a wasteful number, since it uses less digits than its factorization.

81547241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951.

The product of its digits is 8960, while the sum is 32.

The square root of 81547241 is about 9030.3511005940. The cubic root of 81547241 is about 433.6470776516.

The spelling of 81547241 in words is "eighty-one million, five hundred forty-seven thousand, two hundred forty-one".