81210274147 has 4 divisors (see below), whose sum is σ = 81218637976. Its totient is φ = 81201910320.

The previous prime is 81210274141. The next prime is 81210274213. The reversal of 81210274147 is 74147201218.

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 81210274147 - 2²³ = 81201885539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81210274141) 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, 4167333 + ... + 4186774.

It is an arithmetic number, because the mean of its divisors is an integer number (20304659494).

Almost surely, 2^81210274147 is an apocalyptic number.

81210274147 is a deficient number, since it is larger than the sum of its proper divisors (8363829).

81210274147 is an equidigital number, since it uses as much as digits as its factorization.

81210274147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363828.

The product of its (nonzero) digits is 25088, while the sum is 37.

The spelling of 81210274147 in words is "eighty-one billion, two hundred ten million, two hundred seventy-four thousand, one hundred forty-seven".