1236121125 has 64 divisors (see below), whose sum is σ = 2144323584. Its totient is φ = 631680000.

The previous prime is 1236121097. The next prime is 1236121127. The reversal of 1236121125 is 5211216321.

It is a happy number.

It is not a de Polignac number, because 1236121125 - 2¹⁶ = 1236055589 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1236121095 and 1236121104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1236121127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1313155 + ... + 1314095.

It is an arithmetic number, because the mean of its divisors is an integer number (33505056).

Almost surely, 2^1236121125 is an apocalyptic number.

1236121125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1236121125 is a deficient number, since it is larger than the sum of its proper divisors (908202459).

1236121125 is a wasteful number, since it uses less digits than its factorization.

1236121125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1093 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 1236121125 is about 35158.5142604178. The cubic root of 1236121125 is about 1073.2156806751.

Adding to 1236121125 its reverse (5211216321), we get a palindrome (6447337446).

The spelling of 1236121125 in words is "one billion, two hundred thirty-six million, one hundred twenty-one thousand, one hundred twenty-five".