1281919225 has 12 divisors (see below), whose sum is σ = 1626548176. Its totient is φ = 1001684880.

The previous prime is 1281919211. The next prime is 1281919259. The reversal of 1281919225 is 5229191821.

It is not a de Polignac number, because 1281919225 - 2⁵ = 1281919193 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 595167 + ... + 597316.

Almost surely, 2^1281919225 is an apocalyptic number.

It is an amenable number.

1281919225 is a deficient number, since it is larger than the sum of its proper divisors (344628951).

1281919225 is a wasteful number, since it uses less digits than its factorization.

1281919225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192536 (or 1192531 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The square root of 1281919225 is about 35803.8995781186. The cubic root of 1281919225 is about 1086.3094400316.

The spelling of 1281919225 in words is "one billion, two hundred eighty-one million, nine hundred nineteen thousand, two hundred twenty-five".