1281542156 has 12 divisors (see below), whose sum is σ = 2273421192. Its totient is φ = 631993248.

The previous prime is 1281542149. The next prime is 1281542177. The reversal of 1281542156 is 6512451821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194130 + ... + 2194713.

It is an arithmetic number, because the mean of its divisors is an integer number (189451766).

Almost surely, 2^1281542156 is an apocalyptic number.

It is an amenable number.

1281542156 is a deficient number, since it is larger than the sum of its proper divisors (991879036).

1281542156 is a wasteful number, since it uses less digits than its factorization.

1281542156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388920 (or 4388918 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 1281542156 is about 35798.6334376048. The cubic root of 1281542156 is about 1086.2029190760.

Adding to 1281542156 its reverse (6512451821), we get a palindrome (7793993977).

The spelling of 1281542156 in words is "one billion, two hundred eighty-one million, five hundred forty-two thousand, one hundred fifty-six".