1221152029 has 2 divisors, whose sum is σ = 1221152030. Its totient is φ = 1221152028.

The previous prime is 1221152027. The next prime is 1221152057. The reversal of 1221152029 is 9202511221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197852100 + 23299929 = 34610^2 + 4827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221152029 - 2¹ = 1221152027 is a prime.

Together with 1221152027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221151994 and 1221152012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221152027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610576014 + 610576015.

It is an arithmetic number, because the mean of its divisors is an integer number (610576015).

Almost surely, 2^1221152029 is an apocalyptic number.

It is an amenable number.

1221152029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221152029 is an equidigital number, since it uses as much as digits as its factorization.

1221152029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1221152029 is about 34944.9857490313. The cubic root of 1221152029 is about 1068.8659569179.

The spelling of 1221152029 in words is "one billion, two hundred twenty-one million, one hundred fifty-two thousand, twenty-nine".