1425630281 has 4 divisors (see below), whose sum is σ = 1425715200. Its totient is φ = 1425545364.

The previous prime is 1425630259. The next prime is 1425630301. The reversal of 1425630281 is 1820365241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425630281 is a prime.

It is a super-2 number, since 2×1425630281² = 4064843396208277922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1425630181) 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, 7901 + ... + 53978.

It is an arithmetic number, because the mean of its divisors is an integer number (356428800).

Almost surely, 2^1425630281 is an apocalyptic number.

It is an amenable number.

1425630281 is a deficient number, since it is larger than the sum of its proper divisors (84919).

1425630281 is an equidigital number, since it uses as much as digits as its factorization.

1425630281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84918.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1425630281 is about 37757.5195292276. The cubic root of 1425630281 is about 1125.4744417969.

The spelling of 1425630281 in words is "one billion, four hundred twenty-five million, six hundred thirty thousand, two hundred eighty-one".