1281988533 has 16 divisors (see below), whose sum is σ = 2001154176. Its totient is φ = 714696960.

The previous prime is 1281988523. The next prime is 1281988549. The reversal of 1281988533 is 3358891821.

It is not a de Polignac number, because 1281988533 - 2⁴ = 1281988517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281988523) 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 15 ways as a sum of consecutive naturals, for example, 743616 + ... + 745337.

It is an arithmetic number, because the mean of its divisors is an integer number (125072136).

Almost surely, 2^1281988533 is an apocalyptic number.

It is an amenable number.

1281988533 is a deficient number, since it is larger than the sum of its proper divisors (719165643).

1281988533 is a wasteful number, since it uses less digits than its factorization.

1281988533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489004.

The product of its digits is 414720, while the sum is 48.

The square root of 1281988533 is about 35804.8674484350. The cubic root of 1281988533 is about 1086.3290170784.

The spelling of 1281988533 in words is "one billion, two hundred eighty-one million, nine hundred eighty-eight thousand, five hundred thirty-three".