81152851 has 4 divisors (see below), whose sum is σ = 87395392. Its totient is φ = 74910312.

The previous prime is 81152843. The next prime is 81152867. The reversal of 81152851 is 15825118.

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 81152851 - 2³ = 81152843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81152801) 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, 3121251 + ... + 3121276.

It is an arithmetic number, because the mean of its divisors is an integer number (21848848).

Almost surely, 2^81152851 is an apocalyptic number.

81152851 is a deficient number, since it is larger than the sum of its proper divisors (6242541).

81152851 is a wasteful number, since it uses less digits than its factorization.

81152851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6242540.

The product of its digits is 3200, while the sum is 31.

The square root of 81152851 is about 9008.4877199228. The cubic root of 81152851 is about 432.9468596947.

Adding to 81152851 its reverse (15825118), we get a palindrome (96977969).

The spelling of 81152851 in words is "eighty-one million, one hundred fifty-two thousand, eight hundred fifty-one".