131222011 has 4 divisors (see below), whose sum is σ = 133697952. Its totient is φ = 128746072.

The previous prime is 131221991. The next prime is 131222023. The reversal of 131222011 is 110222131.

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 131222011 - 2²⁵ = 97667579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221982 and 131222000.

It is not an unprimeable number, because it can be changed into a prime (131223011) 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 3 ways as a sum of consecutive naturals, for example, 1237891 + ... + 1237996.

It is an arithmetic number, because the mean of its divisors is an integer number (33424488).

Almost surely, 2^131222011 is an apocalyptic number.

131222011 is a deficient number, since it is larger than the sum of its proper divisors (2475941).

131222011 is an equidigital number, since it uses as much as digits as its factorization.

131222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475940.

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

The square root of 131222011 is about 11455.2176321535. The cubic root of 131222011 is about 508.1620514994.

Adding to 131222011 its reverse (110222131), we get a palindrome (241444142).

The spelling of 131222011 in words is "one hundred thirty-one million, two hundred twenty-two thousand, eleven".