81733031 has 2 divisors, whose sum is σ = 81733032. Its totient is φ = 81733030.

The previous prime is 81733027. The next prime is 81733033. The reversal of 81733031 is 13033718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81733031 - 2² = 81733027 is a prime.

It is a super-2 number, since 2×81733031² = 13360576712893922, which contains 22 as substring.

Together with 81733033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81733033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40866515 + 40866516.

It is an arithmetic number, because the mean of its divisors is an integer number (40866516).

Almost surely, 2^81733031 is an apocalyptic number.

81733031 is a deficient number, since it is larger than the sum of its proper divisors (1).

81733031 is an equidigital number, since it uses as much as digits as its factorization.

81733031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 81733031 is about 9040.6322234676. The cubic root of 81733031 is about 433.9761555419.

Adding to 81733031 its reverse (13033718), we get a palindrome (94766749).

The spelling of 81733031 in words is "eighty-one million, seven hundred thirty-three thousand, thirty-one".