1221652159 has 24 divisors (see below), whose sum is σ = 1523567232. Its totient is φ = 959081760.

The previous prime is 1221652151. The next prime is 1221652169. The reversal of 1221652159 is 9512561221.

It is not a de Polignac number, because 1221652159 - 2³ = 1221652151 is a prime.

It is a super-2 number, since 2×1221652159² = 2984867995178722562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221652151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151032 + ... + 158914.

It is an arithmetic number, because the mean of its divisors is an integer number (63481968).

Almost surely, 2^1221652159 is an apocalyptic number.

1221652159 is a deficient number, since it is larger than the sum of its proper divisors (301915073).

1221652159 is a wasteful number, since it uses less digits than its factorization.

1221652159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8047 (or 8034 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 1221652159 is about 34952.1409787727. The cubic root of 1221652159 is about 1069.0118571160.

The spelling of 1221652159 in words is "one billion, two hundred twenty-one million, six hundred fifty-two thousand, one hundred fifty-nine".