81575141 has 8 divisors (see below), whose sum is σ = 82551744. Its totient is φ = 80604160.

The previous prime is 81575107. The next prime is 81575147. The reversal of 81575141 is 14157518.

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 81575141 - 2¹⁰ = 81574117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81575098 and 81575107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81575147) 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, 32456 + ... + 34878.

It is an arithmetic number, because the mean of its divisors is an integer number (10318968).

Almost surely, 2^81575141 is an apocalyptic number.

It is an amenable number.

81575141 is a deficient number, since it is larger than the sum of its proper divisors (976603).

81575141 is a wasteful number, since it uses less digits than its factorization.

81575141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811.

The product of its digits is 5600, while the sum is 32.

The square root of 81575141 is about 9031.8957589202. The cubic root of 81575141 is about 433.6965270005.

The spelling of 81575141 in words is "eighty-one million, five hundred seventy-five thousand, one hundred forty-one".