131223601 has 4 divisors (see below), whose sum is σ = 133699572. Its totient is φ = 128747632.

The previous prime is 131223569. The next prime is 131223607. The reversal of 131223601 is 106322131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64000000 + 67223601 = 8000^2 + 8199^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223601 - 2⁵ = 131223569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131223607) 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, 1237906 + ... + 1238011.

It is an arithmetic number, because the mean of its divisors is an integer number (33424893).

Almost surely, 2^131223601 is an apocalyptic number.

It is an amenable number.

131223601 is a deficient number, since it is larger than the sum of its proper divisors (2475971).

131223601 is an equidigital number, since it uses as much as digits as its factorization.

131223601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475970.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 131223601 is about 11455.2870326326. The cubic root of 131223601 is about 508.1641039356.

Adding to 131223601 its reverse (106322131), we get a palindrome (237545732).

The spelling of 131223601 in words is "one hundred thirty-one million, two hundred twenty-three thousand, six hundred one".