1281185130 has 32 divisors (see below), whose sum is σ = 3086294400. Its totient is φ = 340377152.

The previous prime is 1281185083. The next prime is 1281185137. The reversal of 1281185130 is 315811821.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1281185137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71310 + ... + 87449.

It is an arithmetic number, because the mean of its divisors is an integer number (96446700).

Almost surely, 2^1281185130 is an apocalyptic number.

1281185130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281185130 is an abundant number, since it is smaller than the sum of its proper divisors (1805109270).

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

1281185130 is a wasteful number, since it uses less digits than its factorization.

1281185130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159038.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 1281185130 is about 35793.6465032553. The cubic root of 1281185130 is about 1086.1020409530.

Adding to 1281185130 its reverse (315811821), we get a palindrome (1596996951).

The spelling of 1281185130 in words is "one billion, two hundred eighty-one million, one hundred eighty-five thousand, one hundred thirty".