1221502159 has 2 divisors, whose sum is σ = 1221502160. Its totient is φ = 1221502158.

The previous prime is 1221502157. The next prime is 1221502171. The reversal of 1221502159 is 9512051221.

It is a weak prime.

It is an emirp because it is prime and its reverse (9512051221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221502159 - 2¹ = 1221502157 is a prime.

It is a super-2 number, since 2×1221502159² = 2984135048883322562, which contains 22 as substring.

Together with 1221502157, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221502157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610751079 + 610751080.

It is an arithmetic number, because the mean of its divisors is an integer number (610751080).

Almost surely, 2^1221502159 is an apocalyptic number.

1221502159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221502159 is an equidigital number, since it uses as much as digits as its factorization.

1221502159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1221502159 is about 34949.9951216019. The cubic root of 1221502159 is about 1068.9681026150.

The spelling of 1221502159 in words is "one billion, two hundred twenty-one million, five hundred two thousand, one hundred fifty-nine".