1681253919 has 12 divisors (see below), whose sum is σ = 2437442592. Its totient is φ = 1116698400.

The previous prime is 1681253909. The next prime is 1681253921. The reversal of 1681253919 is 9193521861.

It is a de Polignac number, because none of the positive numbers 2^k-1681253919 is a prime.

It is a super-2 number, since 2×1681253919² = 5653229480305717122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681253909) 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 11 ways as a sum of consecutive naturals, for example, 342222 + ... + 347099.

It is an arithmetic number, because the mean of its divisors is an integer number (203120216).

Almost surely, 2^1681253919 is an apocalyptic number.

1681253919 is a deficient number, since it is larger than the sum of its proper divisors (756188673).

1681253919 is a wasteful number, since it uses less digits than its factorization.

1681253919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689598 (or 689595 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1681253919 is about 41003.0964562434. The cubic root of 1681253919 is about 1189.0800787722.

The spelling of 1681253919 in words is "one billion, six hundred eighty-one million, two hundred fifty-three thousand, nine hundred nineteen".