81469379 has 4 divisors (see below), whose sum is σ = 82064184. Its totient is φ = 80874576.

The previous prime is 81469373. The next prime is 81469393. The reversal of 81469379 is 97396418.

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 81469379 - 2⁴ = 81469363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81469373) 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, 297197 + ... + 297470.

It is an arithmetic number, because the mean of its divisors is an integer number (20516046).

Almost surely, 2^81469379 is an apocalyptic number.

81469379 is a deficient number, since it is larger than the sum of its proper divisors (594805).

81469379 is a wasteful number, since it uses less digits than its factorization.

81469379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594804.

The product of its digits is 326592, while the sum is 47.

The square root of 81469379 is about 9026.0389429694. The cubic root of 81469379 is about 433.5090170611.

The spelling of 81469379 in words is "eighty-one million, four hundred sixty-nine thousand, three hundred seventy-nine".