1425877121 has 4 divisors (see below), whose sum is σ = 1425986772. Its totient is φ = 1425767472.

The previous prime is 1425877109. The next prime is 1425877127. The reversal of 1425877121 is 1217785241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1217785241 = 43 ⋅28320587.

It can be written as a sum of positive squares in 2 ways, for example, as 752734096 + 673143025 = 27436^2 + 25945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425877121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1425877127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32210 + ... + 62363.

It is an arithmetic number, because the mean of its divisors is an integer number (356496693).

Almost surely, 2^1425877121 is an apocalyptic number.

It is an amenable number.

1425877121 is a deficient number, since it is larger than the sum of its proper divisors (109651).

1425877121 is an equidigital number, since it uses as much as digits as its factorization.

1425877121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109650.

The product of its digits is 31360, while the sum is 38.

The square root of 1425877121 is about 37760.7881406096. The cubic root of 1425877121 is about 1125.5393946070.

The spelling of 1425877121 in words is "one billion, four hundred twenty-five million, eight hundred seventy-seven thousand, one hundred twenty-one".