81342733 has 2 divisors, whose sum is σ = 81342734. Its totient is φ = 81342732.

The previous prime is 81342719. The next prime is 81342763. The reversal of 81342733 is 33724318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65318724 + 16024009 = 8082^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 81342733 - 2¹³ = 81334541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81342695 and 81342704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81342763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40671366 + 40671367.

It is an arithmetic number, because the mean of its divisors is an integer number (40671367).

Almost surely, 2^81342733 is an apocalyptic number.

It is an amenable number.

81342733 is a deficient number, since it is larger than the sum of its proper divisors (1).

81342733 is an equidigital number, since it uses as much as digits as its factorization.

81342733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 81342733 is about 9019.0206231054. The cubic root of 81342733 is about 433.2842673571.

The spelling of 81342733 in words is "eighty-one million, three hundred forty-two thousand, seven hundred thirty-three".