81412151 has 4 divisors (see below), whose sum is σ = 81462600. Its totient is φ = 81361704.

The previous prime is 81412147. The next prime is 81412181. The reversal of 81412151 is 15121418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81412151 - 2² = 81412147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81412181) 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, 22721 + ... + 26058.

It is an arithmetic number, because the mean of its divisors is an integer number (20365650).

Almost surely, 2^81412151 is an apocalyptic number.

81412151 is a deficient number, since it is larger than the sum of its proper divisors (50449).

81412151 is a wasteful number, since it uses less digits than its factorization.

81412151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50448.

The product of its digits is 320, while the sum is 23.

The square root of 81412151 is about 9022.8682246833. The cubic root of 81412151 is about 433.4074874412.

Adding to 81412151 its reverse (15121418), we get a palindrome (96533569).

The spelling of 81412151 in words is "eighty-one million, four hundred twelve thousand, one hundred fifty-one".