1261212423 has 16 divisors (see below), whose sum is σ = 1691703936. Its totient is φ = 835780320.

The previous prime is 1261212413. The next prime is 1261212467. The reversal of 1261212423 is 3242121621.

It is not a de Polignac number, because 1261212423 - 2⁵ = 1261212391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261212393 and 1261212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261212413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394893 + ... + 398073.

It is an arithmetic number, because the mean of its divisors is an integer number (105731496).

Almost surely, 2^1261212423 is an apocalyptic number.

1261212423 is a deficient number, since it is larger than the sum of its proper divisors (430491513).

1261212423 is a wasteful number, since it uses less digits than its factorization.

1261212423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934.

The product of its digits is 1152, while the sum is 24.

The square root of 1261212423 is about 35513.5526665525. The cubic root of 1261212423 is about 1080.4286201657.

The spelling of 1261212423 in words is "one billion, two hundred sixty-one million, two hundred twelve thousand, four hundred twenty-three".