1281329925 has 24 divisors (see below), whose sum is σ = 2120069664. Its totient is φ = 682858560.

The previous prime is 1281329921. The next prime is 1281329941. The reversal of 1281329925 is 5299231821.

It is not a de Polignac number, because 1281329925 - 2² = 1281329921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281329921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106254 + ... + 117696.

It is an arithmetic number, because the mean of its divisors is an integer number (88336236).

Almost surely, 2^1281329925 is an apocalyptic number.

1281329925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281329925 is a deficient number, since it is larger than the sum of its proper divisors (838739739).

1281329925 is a wasteful number, since it uses less digits than its factorization.

1281329925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12949 (or 12944 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1281329925 is about 35795.6690816082. The cubic root of 1281329925 is about 1086.1429552121.

The spelling of 1281329925 in words is "one billion, two hundred eighty-one million, three hundred twenty-nine thousand, nine hundred twenty-five".