220161973 has 2 divisors, whose sum is σ = 220161974. Its totient is φ = 220161972.

The previous prime is 220161971. The next prime is 220161979. The reversal of 220161973 is 379161022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116488849 + 103673124 = 10793^2 + 10182^2 .

It is a cyclic number.

It is not a de Polignac number, because 220161973 - 2¹ = 220161971 is a prime.

Together with 220161971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220161971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110080986 + 110080987.

It is an arithmetic number, because the mean of its divisors is an integer number (110080987).

Almost surely, 2^220161973 is an apocalyptic number.

It is an amenable number.

220161973 is a deficient number, since it is larger than the sum of its proper divisors (1).

220161973 is an equidigital number, since it uses as much as digits as its factorization.

220161973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 220161973 is about 14837.8560782884. The cubic root of 220161973 is about 603.8291889037.

The spelling of 220161973 in words is "two hundred twenty million, one hundred sixty-one thousand, nine hundred seventy-three".