1688375451 has 16 divisors (see below), whose sum is σ = 2724102144. Its totient is φ = 908033664.

The previous prime is 1688375443. The next prime is 1688375573. The reversal of 1688375451 is 1545738861.

It is not a de Polignac number, because 1688375451 - 2³ = 1688375443 is a prime.

It is a super-2 number, since 2×1688375451² = 5701223327078906802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1688375451.

It is not an unprimeable number, because it can be changed into a prime (1688375441) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2364315 + ... + 2365028.

It is an arithmetic number, because the mean of its divisors is an integer number (170256384).

Almost surely, 2^1688375451 is an apocalyptic number.

1688375451 is a deficient number, since it is larger than the sum of its proper divisors (1035726693).

1688375451 is a wasteful number, since it uses less digits than its factorization.

1688375451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729370.

The product of its digits is 806400, while the sum is 48.

The square root of 1688375451 is about 41089.8460814834. The cubic root of 1688375451 is about 1190.7566336562.

The spelling of 1688375451 in words is "one billion, six hundred eighty-eight million, three hundred seventy-five thousand, four hundred fifty-one".