83851661 has 2 divisors, whose sum is σ = 83851662. Its totient is φ = 83851660.

The previous prime is 83851631. The next prime is 83851679. The reversal of 83851661 is 16615838.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 37636 = 9155^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 83851661 - 2²⁶ = 16742797 is a prime.

It is a super-2 number, since 2×83851661² = 14062202104917842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83851631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41925830 + 41925831.

It is an arithmetic number, because the mean of its divisors is an integer number (41925831).

Almost surely, 2^83851661 is an apocalyptic number.

It is an amenable number.

83851661 is a deficient number, since it is larger than the sum of its proper divisors (1).

83851661 is an equidigital number, since it uses as much as digits as its factorization.

83851661 is an evil number, because the sum of its binary digits is even.

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

The square root of 83851661 is about 9157.0552581056. The cubic root of 83851661 is about 437.6939630833.

The spelling of 83851661 in words is "eighty-three million, eight hundred fifty-one thousand, six hundred sixty-one".