1220597173 has 2 divisors, whose sum is σ = 1220597174. Its totient is φ = 1220597172.

The previous prime is 1220597171. The next prime is 1220597197. The reversal of 1220597173 is 3717950221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1218219409 + 2377764 = 34903^2 + 1542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220597173 - 2¹ = 1220597171 is a prime.

Together with 1220597171, 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 (1220597171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610298586 + 610298587.

It is an arithmetic number, because the mean of its divisors is an integer number (610298587).

Almost surely, 2^1220597173 is an apocalyptic number.

It is an amenable number.

1220597173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220597173 is an equidigital number, since it uses as much as digits as its factorization.

1220597173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 1220597173 is about 34937.0458539356. The cubic root of 1220597173 is about 1068.7040451816.

The spelling of 1220597173 in words is "one billion, two hundred twenty million, five hundred ninety-seven thousand, one hundred seventy-three".