1261599423 has 12 divisors (see below), whose sum is σ = 1956766680. Its totient is φ = 720913872.

The previous prime is 1261599421. The next prime is 1261599457. The reversal of 1261599423 is 3249951621.

It is not a de Polignac number, because 1261599423 - 2¹ = 1261599421 is a prime.

It is a super-3 number, since 3×1261599423³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261599421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4291008 + ... + 4291301.

It is an arithmetic number, because the mean of its divisors is an integer number (163063890).

Almost surely, 2^1261599423 is an apocalyptic number.

1261599423 is a deficient number, since it is larger than the sum of its proper divisors (695167257).

1261599423 is an equidigital number, since it uses as much as digits as its factorization.

1261599423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582326 (or 8582319 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 1261599423 is about 35519.0008727723. Note that the first 3 decimals coincide. The cubic root of 1261599423 is about 1080.5391178394.

The spelling of 1261599423 in words is "one billion, two hundred sixty-one million, five hundred ninety-nine thousand, four hundred twenty-three".