1281639054 has 16 divisors (see below), whose sum is σ = 2576292048. Its totient is φ = 425044032.

The previous prime is 1281639031. The next prime is 1281639067. The reversal of 1281639054 is 4509361821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540967 + ... + 543330.

It is an arithmetic number, because the mean of its divisors is an integer number (161018253).

Almost surely, 2^1281639054 is an apocalyptic number.

1281639054 is an abundant number, since it is smaller than the sum of its proper divisors (1294652994).

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

1281639054 is a wasteful number, since it uses less digits than its factorization.

1281639054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084499.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1281639054 is about 35799.9867877071. The cubic root of 1281639054 is about 1086.2302944891.

The spelling of 1281639054 in words is "one billion, two hundred eighty-one million, six hundred thirty-nine thousand, fifty-four".