83156321 has 2 divisors, whose sum is σ = 83156322. Its totient is φ = 83156320.

The previous prime is 83156317. The next prime is 83156347. The reversal of 83156321 is 12365138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 3857296 = 8905^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 83156321 - 2² = 83156317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83156371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41578160 + 41578161.

It is an arithmetic number, because the mean of its divisors is an integer number (41578161).

Almost surely, 2^83156321 is an apocalyptic number.

It is an amenable number.

83156321 is a deficient number, since it is larger than the sum of its proper divisors (1).

83156321 is an equidigital number, since it uses as much as digits as its factorization.

83156321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 83156321 is about 9119.0087728875. The cubic root of 83156321 is about 436.4807440988.

The spelling of 83156321 in words is "eighty-three million, one hundred fifty-six thousand, three hundred twenty-one".