81214358279 has 4 divisors (see below), whose sum is σ = 83834176320. Its totient is φ = 78594540240.

The previous prime is 81214358249. The next prime is 81214358293. The reversal of 81214358279 is 97285341218.

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 81214358279 - 2¹² = 81214354183 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 (81214358249) 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, 1309908974 + ... + 1309909035.

It is an arithmetic number, because the mean of its divisors is an integer number (20958544080).

Almost surely, 2^81214358279 is an apocalyptic number.

81214358279 is a deficient number, since it is larger than the sum of its proper divisors (2619818041).

81214358279 is a wasteful number, since it uses less digits than its factorization.

81214358279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619818040.

The product of its digits is 967680, while the sum is 50.

The spelling of 81214358279 in words is "eighty-one billion, two hundred fourteen million, three hundred fifty-eight thousand, two hundred seventy-nine".