1281051225 has 36 divisors (see below), whose sum is σ = 2326851072. Its totient is φ = 673596000.

The previous prime is 1281051209. The next prime is 1281051251. The reversal of 1281051225 is 5221501821.

It is a happy number.

1281051225 is a `hidden beast` number, since 128 + 1 + 0 + 512 + 25 = 666.

It is not a de Polignac number, because 1281051225 - 2⁴ = 1281051209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24121 + ... + 56070.

It is an arithmetic number, because the mean of its divisors is an integer number (64634752).

Almost surely, 2^1281051225 is an apocalyptic number.

1281051225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281051225 is a deficient number, since it is larger than the sum of its proper divisors (1045799847).

1281051225 is a wasteful number, since it uses less digits than its factorization.

1281051225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80278 (or 80270 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 1281051225 is about 35791.7759408499. The cubic root of 1281051225 is about 1086.0642011026.

The spelling of 1281051225 in words is "one billion, two hundred eighty-one million, fifty-one thousand, two hundred twenty-five".