131224069 has 4 divisors (see below), whose sum is σ = 131373900. Its totient is φ = 131074240.

The previous prime is 131224063. The next prime is 131224073. The reversal of 131224069 is 960422131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960422131 = 2897 ⋅331523.

It can be written as a sum of positive squares in 2 ways, for example, as 75168900 + 56055169 = 8670^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 131224069 - 2³ = 131224061 is a prime.

It is a super-2 number, since 2×131224069² = 34439512569833522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131224061) 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, 73594 + ... + 75355.

It is an arithmetic number, because the mean of its divisors is an integer number (32843475).

Almost surely, 2^131224069 is an apocalyptic number.

It is an amenable number.

131224069 is a deficient number, since it is larger than the sum of its proper divisors (149831).

131224069 is an equidigital number, since it uses as much as digits as its factorization.

131224069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149830.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 131224069 is about 11455.3074598633. The cubic root of 131224069 is about 508.1647080457.

The spelling of 131224069 in words is "one hundred thirty-one million, two hundred twenty-four thousand, sixty-nine".