1688922481 has 8 divisors (see below), whose sum is σ = 1728809984. Its totient is φ = 1649062800.

The previous prime is 1688922479. The next prime is 1688922493. The reversal of 1688922481 is 1842298861.

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

It is a cyclic number.

It is not a de Polignac number, because 1688922481 - 2¹ = 1688922479 is a prime.

It is a super-2 number, since 2×1688922481² = 5704918293654390722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688922401) 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, 165631 + ... + 175531.

It is an arithmetic number, because the mean of its divisors is an integer number (216101248).

Almost surely, 2^1688922481 is an apocalyptic number.

It is an amenable number.

1688922481 is a deficient number, since it is larger than the sum of its proper divisors (39887503).

1688922481 is an equidigital number, since it uses as much as digits as its factorization.

1688922481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13911.

The product of its digits is 442368, while the sum is 49.

The square root of 1688922481 is about 41096.5020530945. The cubic root of 1688922481 is about 1190.8852206291.

The spelling of 1688922481 in words is "one billion, six hundred eighty-eight million, nine hundred twenty-two thousand, four hundred eighty-one".