81346331 has 16 divisors (see below), whose sum is σ = 94583808. Its totient is φ = 69220800.

The previous prime is 81346319. The next prime is 81346381. The reversal of 81346331 is 13364318.

It is a de Polignac number, because none of the positive numbers 2^k-81346331 is a prime.

It is a super-2 number, since 2×81346331² = 13234451134323122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81346294 and 81346303.

It is not an unprimeable number, because it can be changed into a prime (81346381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8471 + ... + 15311.

It is an arithmetic number, because the mean of its divisors is an integer number (5911488).

Almost surely, 2^81346331 is an apocalyptic number.

81346331 is a deficient number, since it is larger than the sum of its proper divisors (13237477).

81346331 is a wasteful number, since it uses less digits than its factorization.

81346331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6922.

The product of its digits is 5184, while the sum is 29.

The square root of 81346331 is about 9019.2200882338. The cubic root of 81346331 is about 433.2906556918.

The spelling of 81346331 in words is "eighty-one million, three hundred forty-six thousand, three hundred thirty-one".