81254651 has 4 divisors (see below), whose sum is σ = 81275712. Its totient is φ = 81233592.

The previous prime is 81254629. The next prime is 81254687. The reversal of 81254651 is 15645218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81254651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81254851) 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, 2900 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (20318928).

Almost surely, 2^81254651 is an apocalyptic number.

81254651 is a deficient number, since it is larger than the sum of its proper divisors (21061).

81254651 is a wasteful number, since it uses less digits than its factorization.

81254651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21060.

The product of its digits is 9600, while the sum is 32.

The square root of 81254651 is about 9014.1361760293. The cubic root of 81254651 is about 433.1278168781.

Adding to 81254651 its reverse (15645218), we get a palindrome (96899869).

The spelling of 81254651 in words is "eighty-one million, two hundred fifty-four thousand, six hundred fifty-one".