81422933 has 2 divisors, whose sum is σ = 81422934. Its totient is φ = 81422932.

The previous prime is 81422899. The next prime is 81422947. The reversal of 81422933 is 33922418.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70677649 + 10745284 = 8407^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 81422933 - 2¹² = 81418837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81422933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81422963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40711466 + 40711467.

It is an arithmetic number, because the mean of its divisors is an integer number (40711467).

Almost surely, 2^81422933 is an apocalyptic number.

It is an amenable number.

81422933 is a deficient number, since it is larger than the sum of its proper divisors (1).

81422933 is an equidigital number, since it uses as much as digits as its factorization.

81422933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 81422933 is about 9023.4656867525. The cubic root of 81422933 is about 433.4266196927.

The spelling of 81422933 in words is "eighty-one million, four hundred twenty-two thousand, nine hundred thirty-three".