1281550131 has 12 divisors (see below), whose sum is σ = 1851464160. Its totient is φ = 854211600.

The previous prime is 1281550111. The next prime is 1281550139. The reversal of 1281550131 is 1310551821.

1281550131 is a `hidden beast` number, since 1 + 2 + 81 + 550 + 1 + 31 = 666.

It is not a de Polignac number, because 1281550131 - 2²⁵ = 1247995699 is a prime.

It is a super-2 number, since 2×1281550131² = 3284741476532234322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1281550095 and 1281550104.

It is not an unprimeable number, because it can be changed into a prime (1281550139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62605 + ... + 80513.

It is an arithmetic number, because the mean of its divisors is an integer number (154288680).

Almost surely, 2^1281550131 is an apocalyptic number.

1281550131 is a deficient number, since it is larger than the sum of its proper divisors (569914029).

1281550131 is a wasteful number, since it uses less digits than its factorization.

1281550131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25866 (or 25863 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 1281550131 is about 35798.7448243650. The cubic root of 1281550131 is about 1086.2051722079.

The spelling of 1281550131 in words is "one billion, two hundred eighty-one million, five hundred fifty thousand, one hundred thirty-one".