1681451888 has 20 divisors (see below), whose sum is σ = 3279682200. Its totient is φ = 835082304.

The previous prime is 1681451887. The next prime is 1681451897. The reversal of 1681451888 is 8881541861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681451881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350270 + ... + 355037.

It is an arithmetic number, because the mean of its divisors is an integer number (163984110).

Almost surely, 2^1681451888 is an apocalyptic number.

It is an amenable number.

1681451888 is a deficient number, since it is larger than the sum of its proper divisors (1598230312).

1681451888 is a wasteful number, since it uses less digits than its factorization.

1681451888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705464 (or 705458 counting only the distinct ones).

The product of its digits is 491520, while the sum is 50.

The square root of 1681451888 is about 41005.5104589615. The cubic root of 1681451888 is about 1189.1267486520.

The spelling of 1681451888 in words is "one billion, six hundred eighty-one million, four hundred fifty-one thousand, eight hundred eighty-eight".