1281000195 has 48 divisors (see below), whose sum is σ = 2277916992. Its totient is φ = 665683200.

The previous prime is 1281000191. The next prime is 1281000221. The reversal of 1281000195 is 5910001821.

It is not a de Polignac number, because 1281000195 - 2² = 1281000191 is a prime.

It is a super-2 number, since 2×1281000195² = 3281922999180076050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1281000191) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 358357 + ... + 361913.

It is an arithmetic number, because the mean of its divisors is an integer number (47456604).

Almost surely, 2^1281000195 is an apocalyptic number.

1281000195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281000195 is a deficient number, since it is larger than the sum of its proper divisors (996916797).

1281000195 is a wasteful number, since it uses less digits than its factorization.

1281000195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3772 (or 3769 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1281000195 is about 35791.0630604904. The cubic root of 1281000195 is about 1086.0497799796.

The spelling of 1281000195 in words is "one billion, two hundred eighty-one million, one hundred ninety-five", and thus it is an aban number.