1281071220 has 96 divisors (see below), whose sum is σ = 4214125440. Its totient is φ = 286671360.

The previous prime is 1281071171. The next prime is 1281071263. The reversal of 1281071220 is 221701821.

It is a super-2 number, since 2×1281071220² = 3282286941424576800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66075 + ... + 83234.

It is an arithmetic number, because the mean of its divisors is an integer number (43897140).

Almost surely, 2^1281071220 is an apocalyptic number.

1281071220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281071220 is an abundant number, since it is smaller than the sum of its proper divisors (2933054220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281071220 is a wasteful number, since it uses less digits than its factorization.

1281071220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149345 (or 149343 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 1281071220 is about 35792.0552637034. The cubic root of 1281071220 is about 1086.0698516029.

The spelling of 1281071220 in words is "one billion, two hundred eighty-one million, seventy-one thousand, two hundred twenty".