1681508493 has 48 divisors (see below), whose sum is σ = 2969948800. Its totient is φ = 895328640.

The previous prime is 1681508459. The next prime is 1681508497. The reversal of 1681508493 is 3948051861.

1681508493 is a `hidden beast` number, since 1 + 6 + 8 + 150 + 8 + 493 = 666.

It is not a de Polignac number, because 1681508493 - 2⁶ = 1681508429 is a prime.

It is a super-2 number, since 2×1681508493² = 5654941624062262098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681508497) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61503 + ... + 84531.

Almost surely, 2^1681508493 is an apocalyptic number.

It is an amenable number.

1681508493 is a deficient number, since it is larger than the sum of its proper divisors (1288440307).

1681508493 is a wasteful number, since it uses less digits than its factorization.

1681508493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23122 (or 23119 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1681508493 is about 41006.2006652652. The cubic root of 1681508493 is about 1189.1400922322.

The spelling of 1681508493 in words is "one billion, six hundred eighty-one million, five hundred eight thousand, four hundred ninety-three".