131223524 has 6 divisors (see below), whose sum is σ = 229641174. Its totient is φ = 65611760.

The previous prime is 131223517. The next prime is 131223539. The reversal of 131223524 is 425322131.

It can be written as a sum of positive squares in only one way, i.e., 130690624 + 532900 = 11432^2 + 730^2 .

It is a super-2 number, since 2×131223524² = 34439226501957152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131223524.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16402937 + ... + 16402944.

It is an arithmetic number, because the mean of its divisors is an integer number (38273529).

Almost surely, 2^131223524 is an apocalyptic number.

It is an amenable number.

131223524 is a deficient number, since it is larger than the sum of its proper divisors (98417650).

131223524 is a wasteful number, since it uses less digits than its factorization.

131223524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805885 (or 32805883 counting only the distinct ones).

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

The square root of 131223524 is about 11455.2836717386. The cubic root of 131223524 is about 508.1640045413.

Adding to 131223524 its reverse (425322131), we get a palindrome (556545655).

The spelling of 131223524 in words is "one hundred thirty-one million, two hundred twenty-three thousand, five hundred twenty-four".