1261444121 has 8 divisors (see below), whose sum is σ = 1442022144. Its totient is φ = 1080959040.

The previous prime is 1261444109. The next prime is 1261444127. The reversal of 1261444121 is 1214441621.

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

It is not a de Polignac number, because 1261444121 - 2⁶ = 1261444057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1261444127) 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, 8801 + ... + 50993.

It is an arithmetic number, because the mean of its divisors is an integer number (180252768).

Almost surely, 2^1261444121 is an apocalyptic number.

It is an amenable number.

1261444121 is a deficient number, since it is larger than the sum of its proper divisors (180578023).

1261444121 is an equidigital number, since it uses as much as digits as its factorization.

1261444121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46471.

The product of its digits is 1536, while the sum is 26.

The square root of 1261444121 is about 35516.8146234991. The cubic root of 1261444121 is about 1080.4947781520.

Adding to 1261444121 its reverse (1214441621), we get a palindrome (2475885742).

The spelling of 1261444121 in words is "one billion, two hundred sixty-one million, four hundred forty-four thousand, one hundred twenty-one".