1281185131 has 8 divisors (see below), whose sum is σ = 1302156000. Its totient is φ = 1260295680.

The previous prime is 1281185083. The next prime is 1281185137. The reversal of 1281185131 is 1315811821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281185131 - 2²³ = 1272796523 is a prime.

It is a super-2 number, since 2×1281185131² = 3282870679790974322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281185093 and 1281185102.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11785 + ... + 51973.

It is an arithmetic number, because the mean of its divisors is an integer number (162769500).

Almost surely, 2^1281185131 is an apocalyptic number.

1281185131 is a deficient number, since it is larger than the sum of its proper divisors (20970869).

1281185131 is an equidigital number, since it uses as much as digits as its factorization.

1281185131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40709.

The product of its digits is 1920, while the sum is 31.

The square root of 1281185131 is about 35793.6465172243. The cubic root of 1281185131 is about 1086.1020412356.

Adding to 1281185131 its reverse (1315811821), we get a palindrome (2596996952).

The spelling of 1281185131 in words is "one billion, two hundred eighty-one million, one hundred eighty-five thousand, one hundred thirty-one".