1275500121 has 32 divisors (see below), whose sum is σ = 2039592960. Its totient is φ = 693225984.

The previous prime is 1275500117. The next prime is 1275500129. The reversal of 1275500121 is 1210055721.

It is not a de Polignac number, because 1275500121 - 2² = 1275500117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1275500091 and 1275500100.

It is not an unprimeable number, because it can be changed into a prime (1275500129) 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 31 ways as a sum of consecutive naturals, for example, 79081 + ... + 93833.

It is an arithmetic number, because the mean of its divisors is an integer number (63737280).

Almost surely, 2^1275500121 is an apocalyptic number.

It is an amenable number.

1275500121 is a deficient number, since it is larger than the sum of its proper divisors (764092839).

1275500121 is a wasteful number, since it uses less digits than its factorization.

1275500121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14965.

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 1275500121 is about 35714.1445508639. The cubic root of 1275500121 is about 1084.4932036803.

Adding to 1275500121 its reverse (1210055721), we get a palindrome (2485555842).

The spelling of 1275500121 in words is "one billion, two hundred seventy-five million, five hundred thousand, one hundred twenty-one".