1220031929 has 2 divisors, whose sum is σ = 1220031930. Its totient is φ = 1220031928.

The previous prime is 1220031889. The next prime is 1220031931. The reversal of 1220031929 is 9291300221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 897901225 + 322130704 = 29965^2 + 17948^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220031929 - 2²⁸ = 951596473 is a prime.

It is a super-2 number, since 2×1220031929² = 2976955815558922082, which contains 22 as substring.

Together with 1220031931, 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 (1220031949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610015964 + 610015965.

It is an arithmetic number, because the mean of its divisors is an integer number (610015965).

Almost surely, 2^1220031929 is an apocalyptic number.

It is an amenable number.

1220031929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220031929 is an equidigital number, since it uses as much as digits as its factorization.

1220031929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1220031929 is about 34928.9554524609. The cubic root of 1220031929 is about 1068.5390516757.

The spelling of 1220031929 in words is "one billion, two hundred twenty million, thirty-one thousand, nine hundred twenty-nine".