1261413123 has 8 divisors (see below), whose sum is σ = 1699223568. Its totient is φ = 832272384.

The previous prime is 1261413113. The next prime is 1261413151. The reversal of 1261413123 is 3213141621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261413123 - 2¹⁶ = 1261347587 is a prime.

It is a super-2 number, since 2×1261413123² = 3182326133753226258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261413093 and 1261413102.

It is not an unprimeable number, because it can be changed into a prime (1261413113) 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, 2167086 + ... + 2167667.

It is an arithmetic number, because the mean of its divisors is an integer number (212402946).

Almost surely, 2^1261413123 is an apocalyptic number.

1261413123 is a deficient number, since it is larger than the sum of its proper divisors (437810445).

1261413123 is an equidigital number, since it uses as much as digits as its factorization.

1261413123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334853.

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

The square root of 1261413123 is about 35516.3782359632. The cubic root of 1261413123 is about 1080.4859275944.

Adding to 1261413123 its reverse (3213141621), we get a palindrome (4474554744).

The spelling of 1261413123 in words is "one billion, two hundred sixty-one million, four hundred thirteen thousand, one hundred twenty-three".