131222405 has 8 divisors (see below), whose sum is σ = 166729752. Its totient is φ = 98802688.

The previous prime is 131222353. The next prime is 131222423. The reversal of 131222405 is 504222131.

It can be written as a sum of positive squares in 4 ways, for example, as 18395521 + 112826884 = 4289^2 + 10622^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131222405 - 2¹² = 131218309 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 771812 + ... + 771981.

It is an arithmetic number, because the mean of its divisors is an integer number (20841219).

Almost surely, 2^131222405 is an apocalyptic number.

It is an amenable number.

131222405 is a deficient number, since it is larger than the sum of its proper divisors (35507347).

131222405 is a wasteful number, since it uses less digits than its factorization.

131222405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543815.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 131222405 is about 11455.2348295441. The cubic root of 131222405 is about 508.1625600921.

Adding to 131222405 its reverse (504222131), we get a palindrome (635444536).

The spelling of 131222405 in words is "one hundred thirty-one million, two hundred twenty-two thousand, four hundred five".