81231469 has 8 divisors (see below), whose sum is σ = 92469312. Its totient is φ = 70635840.

The previous prime is 81231431. The next prime is 81231473. The reversal of 81231469 is 96413218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81231469 - 2⁹ = 81230957 is a prime.

It is a super-2 number, since 2×81231469² = 13197103111795922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81231419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160284 + ... + 160789.

It is an arithmetic number, because the mean of its divisors is an integer number (11558664).

Almost surely, 2^81231469 is an apocalyptic number.

It is an amenable number.

81231469 is a deficient number, since it is larger than the sum of its proper divisors (11237843).

81231469 is a wasteful number, since it uses less digits than its factorization.

81231469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321107.

The product of its digits is 10368, while the sum is 34.

The square root of 81231469 is about 9012.8502151095. The cubic root of 81231469 is about 433.0866224194.

The spelling of 81231469 in words is "eighty-one million, two hundred thirty-one thousand, four hundred sixty-nine".