220161971 has 2 divisors, whose sum is σ = 220161972. Its totient is φ = 220161970.

The previous prime is 220161943. The next prime is 220161973. The reversal of 220161971 is 179161022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220161971 - 2¹⁰ = 220160947 is a prime.

Together with 220161973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220161973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110080985 + 110080986.

It is an arithmetic number, because the mean of its divisors is an integer number (110080986).

Almost surely, 2^220161971 is an apocalyptic number.

220161971 is a deficient number, since it is larger than the sum of its proper divisors (1).

220161971 is an equidigital number, since it uses as much as digits as its factorization.

220161971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 220161971 is about 14837.8560108932. The cubic root of 220161971 is about 603.8291870753.

The spelling of 220161971 in words is "two hundred twenty million, one hundred sixty-one thousand, nine hundred seventy-one".