81514219 has 4 divisors (see below), whose sum is σ = 83717344. Its totient is φ = 79311096.

The previous prime is 81514207. The next prime is 81514229. The reversal of 81514219 is 91241518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91241518 = 2 ⋅45620759.

It is a cyclic number.

It is not a de Polignac number, because 81514219 - 2⁷ = 81514091 is a prime.

It is a super-2 number, since 2×81514219² = 13289135798359922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81514229) 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, 1101507 + ... + 1101580.

It is an arithmetic number, because the mean of its divisors is an integer number (20929336).

Almost surely, 2^81514219 is an apocalyptic number.

81514219 is a deficient number, since it is larger than the sum of its proper divisors (2203125).

81514219 is a wasteful number, since it uses less digits than its factorization.

81514219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203124.

The product of its digits is 2880, while the sum is 31.

The square root of 81514219 is about 9028.5225258621. The cubic root of 81514219 is about 433.5885356050.

The spelling of 81514219 in words is "eighty-one million, five hundred fourteen thousand, two hundred nineteen".