1261240126 has 16 divisors (see below), whose sum is σ = 1936786608. Its totient is φ = 615816000.

The previous prime is 1261240091. The next prime is 1261240129. The reversal of 1261240126 is 6210421621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261240126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261240129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28020 + ... + 57511.

It is an arithmetic number, because the mean of its divisors is an integer number (121049163).

Almost surely, 2^1261240126 is an apocalyptic number.

1261240126 is a deficient number, since it is larger than the sum of its proper divisors (675546482).

1261240126 is a wasteful number, since it uses less digits than its factorization.

1261240126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85707.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1261240126 is about 35513.9426986078. The cubic root of 1261240126 is about 1080.4365307800.

Adding to 1261240126 its reverse (6210421621), we get a palindrome (7471661747).

The spelling of 1261240126 in words is "one billion, two hundred sixty-one million, two hundred forty thousand, one hundred twenty-six".