131222345 has 8 divisors (see below), whose sum is σ = 161307720. Its totient is φ = 102417280.

The previous prime is 131222323. The next prime is 131222353. The reversal of 131222345 is 543222131.

It can be written as a sum of positive squares in 4 ways, for example, as 14992384 + 116229961 = 3872^2 + 10781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131222345 - 2⁶ = 131222281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131222345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319850 + ... + 320259.

It is an arithmetic number, because the mean of its divisors is an integer number (20163465).

Almost surely, 2^131222345 is an apocalyptic number.

It is an amenable number.

131222345 is a deficient number, since it is larger than the sum of its proper divisors (30085375).

131222345 is an equidigital number, since it uses as much as digits as its factorization.

131222345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640155.

The product of its digits is 1440, while the sum is 23.

The square root of 131222345 is about 11455.2322106538. The cubic root of 131222345 is about 508.1624826415.

Adding to 131222345 its reverse (543222131), we get a palindrome (674444476).

The spelling of 131222345 in words is "one hundred thirty-one million, two hundred twenty-two thousand, three hundred forty-five".