83851409 has 2 divisors, whose sum is σ = 83851410. Its totient is φ = 83851408.

The previous prime is 83851387. The next prime is 83851421. The reversal of 83851409 is 90415838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75603025 + 8248384 = 8695^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 83851409 - 2²⁴ = 67074193 is a prime.

It is a super-3 number, since 3×83851409³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83851309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41925704 + 41925705.

It is an arithmetic number, because the mean of its divisors is an integer number (41925705).

Almost surely, 2^83851409 is an apocalyptic number.

It is an amenable number.

83851409 is a deficient number, since it is larger than the sum of its proper divisors (1).

83851409 is an equidigital number, since it uses as much as digits as its factorization.

83851409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 83851409 is about 9157.0414982133. The cubic root of 83851409 is about 437.6935246146.

The spelling of 83851409 in words is "eighty-three million, eight hundred fifty-one thousand, four hundred nine".