1220001929 has 2 divisors, whose sum is σ = 1220001930. Its totient is φ = 1220001928.

The previous prime is 1220001907. The next prime is 1220001947. The reversal of 1220001929 is 9291000221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208257600 + 11744329 = 34760^2 + 3427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220001929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220001898 and 1220001907.

It is not a weakly prime, because it can be changed into another prime (1220031929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610000964 + 610000965.

It is an arithmetic number, because the mean of its divisors is an integer number (610000965).

Almost surely, 2^1220001929 is an apocalyptic number.

It is an amenable number.

1220001929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220001929 is an equidigital number, since it uses as much as digits as its factorization.

1220001929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1220001929 is about 34928.5260066897. The cubic root of 1220001929 is about 1068.5302933163.

The spelling of 1220001929 in words is "one billion, two hundred twenty million, one thousand, nine hundred twenty-nine".