1220131911 has 32 divisors (see below), whose sum is σ = 1733149440. Its totient is φ = 761370624.

The previous prime is 1220131903. The next prime is 1220131933. The reversal of 1220131911 is 1191310221.

It is a happy number.

1220131911 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1220131911 - 2³ = 1220131903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220131901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2166916 + ... + 2167478.

It is an arithmetic number, because the mean of its divisors is an integer number (54160920).

Almost surely, 2^1220131911 is an apocalyptic number.

1220131911 is a deficient number, since it is larger than the sum of its proper divisors (513017529).

1220131911 is a wasteful number, since it uses less digits than its factorization.

1220131911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 108, while the sum is 21.

The square root of 1220131911 is about 34930.3866425781. The cubic root of 1220131911 is about 1068.5682399154.

The spelling of 1220131911 in words is "one billion, two hundred twenty million, one hundred thirty-one thousand, nine hundred eleven".