1281790625 has 12 divisors (see below), whose sum is σ = 1602139644. Its totient is φ = 1025430000.

The previous prime is 1281790613. The next prime is 1281790639. The reversal of 1281790625 is 5260971821.

It can be written as a sum of positive squares in 6 ways, for example, as 1235100736 + 46689889 = 35144^2 + 6833^2 .

It is not a de Polignac number, because 1281790625 - 2⁶ = 1281790561 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 201962 + ... + 208211.

It is an arithmetic number, because the mean of its divisors is an integer number (133511637).

Almost surely, 2^1281790625 is an apocalyptic number.

It is an amenable number.

1281790625 is a deficient number, since it is larger than the sum of its proper divisors (320349019).

1281790625 is an frugal number, since it uses more digits than its factorization.

1281790625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410198 (or 410178 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1281790625 is about 35802.1036393115. The cubic root of 1281790625 is about 1086.2731132327.

The spelling of 1281790625 in words is "one billion, two hundred eighty-one million, seven hundred ninety thousand, six hundred twenty-five".