1220322131 has 4 divisors (see below), whose sum is σ = 1394653872. Its totient is φ = 1045990392.

The previous prime is 1220322127. The next prime is 1220322133. The reversal of 1220322131 is 1312230221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220322131 - 2² = 1220322127 is a prime.

It is a super-2 number, since 2×1220322131² = 2978372206816762322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220322133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87165860 + ... + 87165873.

It is an arithmetic number, because the mean of its divisors is an integer number (348663468).

Almost surely, 2^1220322131 is an apocalyptic number.

1220322131 is a deficient number, since it is larger than the sum of its proper divisors (174331741).

1220322131 is an equidigital number, since it uses as much as digits as its factorization.

1220322131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174331740.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1220322131 is about 34933.1093806435. The cubic root of 1220322131 is about 1068.6237673784.

Adding to 1220322131 its reverse (1312230221), we get a palindrome (2532552352).

The spelling of 1220322131 in words is "one billion, two hundred twenty million, three hundred twenty-two thousand, one hundred thirty-one".