81146369 has 4 divisors (see below), whose sum is σ = 84674496. Its totient is φ = 77618244.

The previous prime is 81146363. The next prime is 81146381. The reversal of 81146369 is 96364118.

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 81146369 - 2⁴ = 81146353 is a prime.

It is a super-2 number, since 2×81146369² = 13169466403768322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81146363) 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, 1764029 + ... + 1764074.

It is an arithmetic number, because the mean of its divisors is an integer number (21168624).

Almost surely, 2^81146369 is an apocalyptic number.

It is an amenable number.

81146369 is a deficient number, since it is larger than the sum of its proper divisors (3528127).

81146369 is a wasteful number, since it uses less digits than its factorization.

81146369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528126.

The product of its digits is 31104, while the sum is 38.

The square root of 81146369 is about 9008.1279409209. The cubic root of 81146369 is about 432.9353323270.

The spelling of 81146369 in words is "eighty-one million, one hundred forty-six thousand, three hundred sixty-nine".