1220120131 has 4 divisors (see below), whose sum is σ = 1284337000. Its totient is φ = 1155903264.

The previous prime is 1220120129. The next prime is 1220120137. The reversal of 1220120131 is 1310210221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1310210221 = 911 ⋅1438211.

It is a cyclic number.

It is not a de Polignac number, because 1220120131 - 2¹ = 1220120129 is a prime.

It is a super-2 number, since 2×1220120131² = 2977386268142914322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220120137) 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, 32108406 + ... + 32108443.

It is an arithmetic number, because the mean of its divisors is an integer number (321084250).

Almost surely, 2^1220120131 is an apocalyptic number.

1220120131 is a deficient number, since it is larger than the sum of its proper divisors (64216869).

1220120131 is an equidigital number, since it uses as much as digits as its factorization.

1220120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64216868.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1220120131 is about 34930.2180210774. The cubic root of 1220120131 is about 1068.5648010046.

Adding to 1220120131 its reverse (1310210221), we get a palindrome (2530330352).

The spelling of 1220120131 in words is "one billion, two hundred twenty million, one hundred twenty thousand, one hundred thirty-one".