1681371515 has 8 divisors (see below), whose sum is σ = 2018478480. Its totient is φ = 1344542112.

The previous prime is 1681371491. The next prime is 1681371529. The reversal of 1681371515 is 5151731861.

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 1681371515 - 2¹² = 1681367419 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55820 + ... + 80489.

It is an arithmetic number, because the mean of its divisors is an integer number (252309810).

Almost surely, 2^1681371515 is an apocalyptic number.

1681371515 is a deficient number, since it is larger than the sum of its proper divisors (337106965).

1681371515 is a wasteful number, since it uses less digits than its factorization.

1681371515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138781.

The product of its digits is 25200, while the sum is 38.

The square root of 1681371515 is about 41004.5304204304. The cubic root of 1681371515 is about 1189.1078016916.

The spelling of 1681371515 in words is "one billion, six hundred eighty-one million, three hundred seventy-one thousand, five hundred fifteen".