1281625543 has 8 divisors (see below), whose sum is σ = 1413847440. Its totient is φ = 1152022080.

The previous prime is 1281625537. The next prime is 1281625577. The reversal of 1281625543 is 3455261821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281625543 - 2⁵ = 1281625511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281625523) 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, 653580 + ... + 655537.

It is an arithmetic number, because the mean of its divisors is an integer number (176730930).

Almost surely, 2^1281625543 is an apocalyptic number.

1281625543 is a deficient number, since it is larger than the sum of its proper divisors (132221897).

1281625543 is a wasteful number, since it uses less digits than its factorization.

1281625543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309217.

The product of its digits is 57600, while the sum is 37.

The square root of 1281625543 is about 35799.7980860228. The cubic root of 1281625543 is about 1086.2264774735.

The spelling of 1281625543 in words is "one billion, two hundred eighty-one million, six hundred twenty-five thousand, five hundred forty-three".