1281257144 has 16 divisors (see below), whose sum is σ = 2403075600. Its totient is φ = 640436992.

The previous prime is 1281257141. The next prime is 1281257161. The reversal of 1281257144 is 4417521821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281257141) 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 3 ways as a sum of consecutive naturals, for example, 6797 + ... + 51075.

It is an arithmetic number, because the mean of its divisors is an integer number (150192225).

Almost surely, 2^1281257144 is an apocalyptic number.

It is an amenable number.

1281257144 is a deficient number, since it is larger than the sum of its proper divisors (1121818456).

1281257144 is a wasteful number, since it uses less digits than its factorization.

1281257144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47902 (or 47898 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 1281257144 is about 35794.6524497724. The cubic root of 1281257144 is about 1086.1223901035.

Adding to 1281257144 its reverse (4417521821), we get a palindrome (5698778965).

The spelling of 1281257144 in words is "one billion, two hundred eighty-one million, two hundred fifty-seven thousand, one hundred forty-four".