1221652158 has 24 divisors (see below), whose sum is σ = 2578672008. Its totient is φ = 385784208.

The previous prime is 1221652151. The next prime is 1221652169. The reversal of 1221652158 is 8512561221.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279841 + ... + 284172.

It is an arithmetic number, because the mean of its divisors is an integer number (107444667).

Almost surely, 2^1221652158 is an apocalyptic number.

1221652158 is an abundant number, since it is smaller than the sum of its proper divisors (1357019850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221652158 is a wasteful number, since it uses less digits than its factorization.

1221652158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564056 (or 564037 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 1221652158 is about 34952.1409644674. The cubic root of 1221652158 is about 1069.0118568243.

The spelling of 1221652158 in words is "one billion, two hundred twenty-one million, six hundred fifty-two thousand, one hundred fifty-eight".