81214582249 has 4 divisors (see below), whose sum is σ = 81238535680. Its totient is φ = 81190628820.

The previous prime is 81214582213. The next prime is 81214582261. The reversal of 81214582249 is 94228541218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81214582249 - 2¹⁹ = 81214057961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81214582199 and 81214582208.

It is not an unprimeable number, because it can be changed into a prime (81214582849) 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, 11971629 + ... + 11978410.

It is an arithmetic number, because the mean of its divisors is an integer number (20309633920).

Almost surely, 2^81214582249 is an apocalyptic number.

It is an amenable number.

81214582249 is a deficient number, since it is larger than the sum of its proper divisors (23953431).

81214582249 is a wasteful number, since it uses less digits than its factorization.

81214582249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23953430.

The product of its digits is 368640, while the sum is 46.

The spelling of 81214582249 in words is "eighty-one billion, two hundred fourteen million, five hundred eighty-two thousand, two hundred forty-nine".