1263546121 has 4 divisors (see below), whose sum is σ = 1263748500. Its totient is φ = 1263343744.

The previous prime is 1263546107. The next prime is 1263546149. The reversal of 1263546121 is 1216453621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216453621 = 2909 ⋅418169.

It can be written as a sum of positive squares in 2 ways, for example, as 830073721 + 433472400 = 28811^2 + 20820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263546121 - 2²⁵ = 1229991689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263546161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91516 + ... + 104413.

It is an arithmetic number, because the mean of its divisors is an integer number (315937125).

Almost surely, 2^1263546121 is an apocalyptic number.

It is an amenable number.

1263546121 is a deficient number, since it is larger than the sum of its proper divisors (202379).

1263546121 is an equidigital number, since it uses as much as digits as its factorization.

1263546121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202378.

The product of its digits is 8640, while the sum is 31.

The square root of 1263546121 is about 35546.3939239974. The cubic root of 1263546121 is about 1081.0946038118.

Adding to 1263546121 its reverse (1216453621), we get a palindrome (2479999742).

The spelling of 1263546121 in words is "one billion, two hundred sixty-three million, five hundred forty-six thousand, one hundred twenty-one".