1220001973 has 2 divisors, whose sum is σ = 1220001974. Its totient is φ = 1220001972.

The previous prime is 1220001947. The next prime is 1220002019. The reversal of 1220001973 is 3791000221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636199729 + 583802244 = 25223^2 + 24162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220001973 - 2²⁵ = 1186447541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220008973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610000986 + 610000987.

It is an arithmetic number, because the mean of its divisors is an integer number (610000987).

Almost surely, 2^1220001973 is an apocalyptic number.

It is an amenable number.

1220001973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220001973 is an equidigital number, since it uses as much as digits as its factorization.

1220001973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1220001973 is about 34928.5266365474. The cubic root of 1220001973 is about 1068.5303061620.

The spelling of 1220001973 in words is "one billion, two hundred twenty million, one thousand, nine hundred seventy-three".