1281132900 has 54 divisors (see below), whose sum is σ = 4015642722. Its totient is φ = 341635200.

The previous prime is 1281132899. The next prime is 1281132901. The reversal of 1281132900 is 92311821.

It is an interprime number because it is at equal distance from previous prime (1281132899) and next prime (1281132901).

It can be written as a sum of positive squares in 3 ways, for example, as 88397604 + 1192735296 = 9402^2 + 34536^2 .

It is not an unprimeable number, because it can be changed into a prime (1281132901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 710841 + ... + 712640.

Almost surely, 2^1281132900 is an apocalyptic number.

1281132900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281132900 is an abundant number, since it is smaller than the sum of its proper divisors (2734509822).

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

1281132900 is a wasteful number, since it uses less digits than its factorization.

1281132900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423501 (or 1423491 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1281132900 is about 35792.9168970622. The cubic root of 1281132900 is about 1086.0872817328.

The spelling of 1281132900 in words is "one billion, two hundred eighty-one million, one hundred thirty-two thousand, nine hundred".