162821917 has 2 divisors, whose sum is σ = 162821918. Its totient is φ = 162821916.

The previous prime is 162821753. The next prime is 162822041. The reversal of 162821917 is 719128261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138556441 + 24265476 = 11771^2 + 4926^2 .

It is an emirp because it is prime and its reverse (719128261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162821917 - 2¹⁵ = 162789149 is a prime.

It is a lonely number, since its distance to closest prime (162822041) sets a new record.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162824917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81410958 + 81410959.

It is an arithmetic number, because the mean of its divisors is an integer number (81410959).

Almost surely, 2^162821917 is an apocalyptic number.

It is an amenable number.

162821917 is a deficient number, since it is larger than the sum of its proper divisors (1).

162821917 is an equidigital number, since it uses as much as digits as its factorization.

162821917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 162821917 is about 12760.1691603207. The cubic root of 162821917 is about 546.0565504273.

The spelling of 162821917 in words is "one hundred sixty-two million, eight hundred twenty-one thousand, nine hundred seventeen".