1221003149 has 2 divisors, whose sum is σ = 1221003150. Its totient is φ = 1221003148.

The previous prime is 1221003131. The next prime is 1221003151. The reversal of 1221003149 is 9413001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992691049 + 228312100 = 31507^2 + 15110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221003149 - 2²⁰ = 1219954573 is a prime.

Together with 1221003151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221008149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501574 + 610501575.

It is an arithmetic number, because the mean of its divisors is an integer number (610501575).

Almost surely, 2^1221003149 is an apocalyptic number.

It is an amenable number.

1221003149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221003149 is an equidigital number, since it uses as much as digits as its factorization.

1221003149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221003149 is about 34942.8554786240. The cubic root of 1221003149 is about 1068.8225172731.

The spelling of 1221003149 in words is "one billion, two hundred twenty-one million, three thousand, one hundred forty-nine".