1222135531 has 4 divisors (see below), whose sum is σ = 1222295992. Its totient is φ = 1221975072.

The previous prime is 1222135517. The next prime is 1222135547. The reversal of 1222135531 is 1355312221.

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

It is a cyclic number.

It is not a de Polignac number, because 1222135531 - 2⁷ = 1222135403 is a prime.

It is a super-2 number, since 2×1222135531² = 2987230512265303922, 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 = 1222135496 and 1222135505.

It is not an unprimeable number, because it can be changed into a prime (1222135591) 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, 68205 + ... + 84238.

It is an arithmetic number, because the mean of its divisors is an integer number (305573998).

Almost surely, 2^1222135531 is an apocalyptic number.

1222135531 is a deficient number, since it is larger than the sum of its proper divisors (160461).

1222135531 is an equidigital number, since it uses as much as digits as its factorization.

1222135531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160460.

The product of its digits is 1800, while the sum is 25.

The square root of 1222135531 is about 34959.0550644608. The cubic root of 1222135531 is about 1069.1528307581.

Adding to 1222135531 its reverse (1355312221), we get a palindrome (2577447752).

The spelling of 1222135531 in words is "one billion, two hundred twenty-two million, one hundred thirty-five thousand, five hundred thirty-one".