81142541 has 8 divisors (see below), whose sum is σ = 81967200. Its totient is φ = 80322192.

The previous prime is 81142519. The next prime is 81142553. The reversal of 81142541 is 14524118.

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 81142541 - 2²² = 76948237 is a prime.

It is a super-2 number, since 2×81142541² = 13168223919873362, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81142541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81142511) 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, 46910 + ... + 48608.

It is an arithmetic number, because the mean of its divisors is an integer number (10245900).

Almost surely, 2^81142541 is an apocalyptic number.

It is an amenable number.

81142541 is a deficient number, since it is larger than the sum of its proper divisors (824659).

81142541 is a wasteful number, since it uses less digits than its factorization.

81142541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155.

The product of its digits is 1280, while the sum is 26.

The square root of 81142541 is about 9007.9154636353. The cubic root of 81142541 is about 432.9285244540.

Adding to 81142541 its reverse (14524118), we get a palindrome (95666659).

The spelling of 81142541 in words is "eighty-one million, one hundred forty-two thousand, five hundred forty-one".