1223435131 has 4 divisors (see below), whose sum is σ = 1230941032. Its totient is φ = 1215929232.

The previous prime is 1223435123. The next prime is 1223435177. The reversal of 1223435131 is 1315343221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1315343221 = 109 ⋅12067369.

It is a cyclic number.

It is not a de Polignac number, because 1223435131 - 2³ = 1223435123 is a prime.

It is a super-2 number, since 2×1223435131² = 2993587039529974322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223435096 and 1223435105.

It is not an unprimeable number, because it can be changed into a prime (1223435231) 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, 3752706 + ... + 3753031.

It is an arithmetic number, because the mean of its divisors is an integer number (307735258).

Almost surely, 2^1223435131 is an apocalyptic number.

1223435131 is a deficient number, since it is larger than the sum of its proper divisors (7505901).

1223435131 is an equidigital number, since it uses as much as digits as its factorization.

1223435131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505900.

The product of its digits is 2160, while the sum is 25.

The square root of 1223435131 is about 34977.6375846054. The cubic root of 1223435131 is about 1069.5316700276.

Adding to 1223435131 its reverse (1315343221), we get a palindrome (2538778352).

The spelling of 1223435131 in words is "one billion, two hundred twenty-three million, four hundred thirty-five thousand, one hundred thirty-one".