1261125242 has 48 divisors (see below), whose sum is σ = 2145071880. Its totient is φ = 552375936.

The previous prime is 1261125181. The next prime is 1261125277. The reversal of 1261125242 is 2425211621.

It can be written as a sum of positive squares in 4 ways, for example, as 898260841 + 362864401 = 29971^2 + 19049^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1778384 + ... + 1779092.

Almost surely, 2^1261125242 is an apocalyptic number.

1261125242 is a deficient number, since it is larger than the sum of its proper divisors (883946638).

1261125242 is a wasteful number, since it uses less digits than its factorization.

1261125242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 804 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 1261125242 is about 35512.3252125230. The cubic root of 1261125242 is about 1080.4037248041.

Adding to 1261125242 its reverse (2425211621), we get a palindrome (3686336863).

The spelling of 1261125242 in words is "one billion, two hundred sixty-one million, one hundred twenty-five thousand, two hundred forty-two".