1681126551 has 24 divisors (see below), whose sum is σ = 2640493856. Its totient is φ = 1024488000.

The previous prime is 1681126523. The next prime is 1681126591. The reversal of 1681126551 is 1556211861.

1681126551 is a `hidden beast` number, since 1 + 6 + 81 + 1 + 26 + 551 = 666.

It is not a de Polignac number, because 1681126551 - 2⁵ = 1681126519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681126591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57700 + ... + 81801.

Almost surely, 2^1681126551 is an apocalyptic number.

1681126551 is a deficient number, since it is larger than the sum of its proper divisors (959367305).

1681126551 is a wasteful number, since it uses less digits than its factorization.

1681126551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139623 (or 139620 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 1681126551 is about 41001.5432758329. The cubic root of 1681126551 is about 1189.0500506734.

The spelling of 1681126551 in words is "one billion, six hundred eighty-one million, one hundred twenty-six thousand, five hundred fifty-one".