1235163121 has 2 divisors, whose sum is σ = 1235163122. Its totient is φ = 1235163120.

The previous prime is 1235163113. The next prime is 1235163143. The reversal of 1235163121 is 1213615321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828576225 + 406586896 = 28785^2 + 20164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1235163121 - 2³ = 1235163113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1235163151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617581560 + 617581561.

It is an arithmetic number, because the mean of its divisors is an integer number (617581561).

Almost surely, 2^1235163121 is an apocalyptic number.

It is an amenable number.

1235163121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235163121 is an equidigital number, since it uses as much as digits as its factorization.

1235163121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 1235163121 is about 35144.8875513922. The cubic root of 1235163121 is about 1072.9383587052.

Adding to 1235163121 its reverse (1213615321), we get a palindrome (2448778442).

The spelling of 1235163121 in words is "one billion, two hundred thirty-five million, one hundred sixty-three thousand, one hundred twenty-one".