81682031 has 2 divisors, whose sum is σ = 81682032. Its totient is φ = 81682030.

The previous prime is 81681961. The next prime is 81682049. The reversal of 81682031 is 13028618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81682031 - 2²² = 77487727 is a prime.

It is a super-2 number, since 2×81682031² = 13343908376569922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81681985 and 81682003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81682061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40841015 + 40841016.

It is an arithmetic number, because the mean of its divisors is an integer number (40841016).

Almost surely, 2^81682031 is an apocalyptic number.

81682031 is a deficient number, since it is larger than the sum of its proper divisors (1).

81682031 is an equidigital number, since it uses as much as digits as its factorization.

81682031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81682031 is about 9037.8111841308. The cubic root of 81682031 is about 433.8858722185.

The spelling of 81682031 in words is "eighty-one million, six hundred eighty-two thousand, thirty-one".