1261426323 has 4 divisors (see below), whose sum is σ = 1681901768. Its totient is φ = 840950880.

The previous prime is 1261426319. The next prime is 1261426409. The reversal of 1261426323 is 3236241621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1261426323 - 2² = 1261426319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261426303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210237718 + ... + 210237723.

It is an arithmetic number, because the mean of its divisors is an integer number (420475442).

Almost surely, 2^1261426323 is an apocalyptic number.

1261426323 is a deficient number, since it is larger than the sum of its proper divisors (420475445).

1261426323 is an equidigital number, since it uses as much as digits as its factorization.

1261426323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420475444.

The product of its digits is 10368, while the sum is 30.

The square root of 1261426323 is about 35516.5640652358. The cubic root of 1261426323 is about 1080.4896964798.

Adding to 1261426323 its reverse (3236241621), we get a palindrome (4497667944).

The spelling of 1261426323 in words is "one billion, two hundred sixty-one million, four hundred twenty-six thousand, three hundred twenty-three".