1983312515 has 4 divisors (see below), whose sum is σ = 2379975024. Its totient is φ = 1586650008.

The previous prime is 1983312491. The next prime is 1983312559. The reversal of 1983312515 is 5152133891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5152133891 = 14197 ⋅362903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1983312515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 198331247 + ... + 198331256.

It is an arithmetic number, because the mean of its divisors is an integer number (594993756).

Almost surely, 2^1983312515 is an apocalyptic number.

1983312515 is a deficient number, since it is larger than the sum of its proper divisors (396662509).

1983312515 is an equidigital number, since it uses as much as digits as its factorization.

1983312515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396662508.

The product of its digits is 32400, while the sum is 38.

The square root of 1983312515 is about 44534.3969870481. The cubic root of 1983312515 is about 1256.4071062807.

The spelling of 1983312515 in words is "one billion, nine hundred eighty-three million, three hundred twelve thousand, five hundred fifteen".