1281831242 has 16 divisors (see below), whose sum is σ = 1931817600. Its totient is φ = 637900032.

The previous prime is 1281831241. The next prime is 1281831253. The reversal of 1281831242 is 2421381821.

It is a junction number, because it is equal to n+sod(n) for n = 1281831199 and 1281831208.

It is not an unprimeable number, because it can be changed into a prime (1281831241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414233 + ... + 417315.

It is an arithmetic number, because the mean of its divisors is an integer number (120738600).

Almost surely, 2^1281831242 is an apocalyptic number.

1281831242 is a deficient number, since it is larger than the sum of its proper divisors (649986358).

1281831242 is a wasteful number, since it uses less digits than its factorization.

1281831242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997.

The product of its digits is 6144, while the sum is 32.

The square root of 1281831242 is about 35802.6708780225. The cubic root of 1281831242 is about 1086.2845869446.

The spelling of 1281831242 in words is "one billion, two hundred eighty-one million, eight hundred thirty-one thousand, two hundred forty-two".