1281625542 has 24 divisors (see below), whose sum is σ = 2829250944. Its totient is φ = 419147664.

The previous prime is 1281625537. The next prime is 1281625577. The reversal of 1281625542 is 2455261821.

1281625542 is a `hidden beast` number, since 1 + 28 + 1 + 625 + 5 + 4 + 2 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1281625497 and 1281625506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670758 + ... + 672665.

It is an arithmetic number, because the mean of its divisors is an integer number (117885456).

Almost surely, 2^1281625542 is an apocalyptic number.

1281625542 is an abundant number, since it is smaller than the sum of its proper divisors (1547625402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281625542 is a wasteful number, since it uses less digits than its factorization.

1281625542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343484 (or 1343481 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 1281625542 is about 35799.7980720562. The cubic root of 1281625542 is about 1086.2264771910.

The spelling of 1281625542 in words is "one billion, two hundred eighty-one million, six hundred twenty-five thousand, five hundred forty-two".