83551381 has 2 divisors, whose sum is σ = 83551382. Its totient is φ = 83551380.

The previous prime is 83551361. The next prime is 83551393. The reversal of 83551381 is 18315538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 194481 = 9130^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 83551381 - 2⁷ = 83551253 is a prime.

It is a super-2 number, since 2×83551381² = 13961666534014322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83551361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41775690 + 41775691.

It is an arithmetic number, because the mean of its divisors is an integer number (41775691).

Almost surely, 2^83551381 is an apocalyptic number.

It is an amenable number.

83551381 is a deficient number, since it is larger than the sum of its proper divisors (1).

83551381 is an equidigital number, since it uses as much as digits as its factorization.

83551381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 83551381 is about 9140.6444521161. The cubic root of 83551381 is about 437.1708649407.

The spelling of 83551381 in words is "eighty-three million, five hundred fifty-one thousand, three hundred eighty-one".