1231545122 has 16 divisors (see below), whose sum is σ = 1909377792. Its totient is φ = 595137360.

The previous prime is 1231545109. The next prime is 1231545149. The reversal of 1231545122 is 2215451321.

It is a junction number, because it is equal to n+sod(n) for n = 1231545091 and 1231545100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36953 + ... + 61875.

It is an arithmetic number, because the mean of its divisors is an integer number (119336112).

Almost surely, 2^1231545122 is an apocalyptic number.

1231545122 is a deficient number, since it is larger than the sum of its proper divisors (677832670).

1231545122 is a wasteful number, since it uses less digits than its factorization.

1231545122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25753.

The product of its digits is 2400, while the sum is 26.

The square root of 1231545122 is about 35093.3771814569. The cubic root of 1231545122 is about 1071.8897289717.

Adding to 1231545122 its reverse (2215451321), we get a palindrome (3446996443).

The spelling of 1231545122 in words is "one billion, two hundred thirty-one million, five hundred forty-five thousand, one hundred twenty-two".