81083357 has 2 divisors, whose sum is σ = 81083358. Its totient is φ = 81083356.

The previous prime is 81083347. The next prime is 81083369. The reversal of 81083357 is 75338018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79049881 + 2033476 = 8891^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 81083357 - 2¹² = 81079261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81083347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40541678 + 40541679.

It is an arithmetic number, because the mean of its divisors is an integer number (40541679).

Almost surely, 2^81083357 is an apocalyptic number.

It is an amenable number.

81083357 is a deficient number, since it is larger than the sum of its proper divisors (1).

81083357 is an equidigital number, since it uses as much as digits as its factorization.

81083357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81083357 is about 9004.6297536323. The cubic root of 81083357 is about 432.8232419330.

The spelling of 81083357 in words is "eighty-one million, eighty-three thousand, three hundred fifty-seven".