1261123413 has 16 divisors (see below), whose sum is σ = 1842048000. Its totient is φ = 761114480.

The previous prime is 1261123397. The next prime is 1261123421. The reversal of 1261123413 is 3143211621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1261123413 - 2⁴ = 1261123397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261123433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72063 + ... + 87836.

It is an arithmetic number, because the mean of its divisors is an integer number (115128000).

Almost surely, 2^1261123413 is an apocalyptic number.

It is an amenable number.

1261123413 is a deficient number, since it is larger than the sum of its proper divisors (580924587).

1261123413 is a wasteful number, since it uses less digits than its factorization.

1261123413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160152.

The product of its digits is 864, while the sum is 24.

The square root of 1261123413 is about 35512.2994608910. The cubic root of 1261123413 is about 1080.4032025035.

The spelling of 1261123413 in words is "one billion, two hundred sixty-one million, one hundred twenty-three thousand, four hundred thirteen".