1687122481 has 12 divisors (see below), whose sum is σ = 1893902976. Its totient is φ = 1501109720.

The previous prime is 1687122467. The next prime is 1687122487. The reversal of 1687122481 is 1842217861.

It is not a de Polignac number, because 1687122481 - 2¹⁷ = 1686991409 is a prime.

It is a super-2 number, since 2×1687122481² = 5692764531791190722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1687122487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142645 + ... + 154018.

It is an arithmetic number, because the mean of its divisors is an integer number (157825248).

Almost surely, 2^1687122481 is an apocalyptic number.

1687122481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1687122481 is a deficient number, since it is larger than the sum of its proper divisors (206780495).

1687122481 is a wasteful number, since it uses less digits than its factorization.

1687122481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296732 (or 296721 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 1687122481 is about 41074.5965409278. The cubic root of 1687122481 is about 1190.4620010129.

The spelling of 1687122481 in words is "one billion, six hundred eighty-seven million, one hundred twenty-two thousand, four hundred eighty-one".