1221083159 has 2 divisors, whose sum is σ = 1221083160. Its totient is φ = 1221083158.

The previous prime is 1221083131. The next prime is 1221083173. The reversal of 1221083159 is 9513801221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221083159 - 2²⁰ = 1220034583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221083119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610541579 + 610541580.

It is an arithmetic number, because the mean of its divisors is an integer number (610541580).

Almost surely, 2^1221083159 is an apocalyptic number.

1221083159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221083159 is an equidigital number, since it uses as much as digits as its factorization.

1221083159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1221083159 is about 34944.0003290980. Note that the first 3 decimals coincide. The cubic root of 1221083159 is about 1068.8458627280.

The spelling of 1221083159 in words is "one billion, two hundred twenty-one million, eighty-three thousand, one hundred fifty-nine".