81472331 has 4 divisors (see below), whose sum is σ = 81503352. Its totient is φ = 81441312.

The previous prime is 81472327. The next prime is 81472351. The reversal of 81472331 is 13327418.

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 81472331 - 2² = 81472327 is a prime.

It is a super-2 number, since 2×81472331² = 13275481437147122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81472294 and 81472303.

It is not an unprimeable number, because it can be changed into a prime (81472301) 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, 11165 + ... + 16958.

It is an arithmetic number, because the mean of its divisors is an integer number (20375838).

Almost surely, 2^81472331 is an apocalyptic number.

81472331 is a deficient number, since it is larger than the sum of its proper divisors (31021).

81472331 is a wasteful number, since it uses less digits than its factorization.

81472331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31020.

The product of its digits is 4032, while the sum is 29.

The square root of 81472331 is about 9026.2024683695. The cubic root of 81472331 is about 433.5142529881.

Adding to 81472331 its reverse (13327418), we get a palindrome (94799749).

The spelling of 81472331 in words is "eighty-one million, four hundred seventy-two thousand, three hundred thirty-one".