131223001 has 16 divisors (see below), whose sum is σ = 165449088. Its totient is φ = 101289600.

The previous prime is 131222989. The next prime is 131223011. The reversal of 131223001 is 100322131.

It is a cyclic number.

It is not a de Polignac number, because 131223001 - 2¹¹ = 131220953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (131223011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13855 + ... + 21316.

It is an arithmetic number, because the mean of its divisors is an integer number (10340568).

Almost surely, 2^131223001 is an apocalyptic number.

It is an amenable number.

131223001 is a deficient number, since it is larger than the sum of its proper divisors (34226087).

131223001 is a wasteful number, since it uses less digits than its factorization.

131223001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35232.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 131223001 is about 11455.2608438219. The cubic root of 131223001 is about 508.1633294333.

Adding to 131223001 its reverse (100322131), we get a palindrome (231545132).

The spelling of 131223001 in words is "one hundred thirty-one million, two hundred twenty-three thousand, one".