1981489615 has 32 divisors (see below), whose sum is σ = 2789297280. Its totient is φ = 1322956800.

The previous prime is 1981489607. The next prime is 1981489637. The reversal of 1981489615 is 5169841891.

It is not a de Polignac number, because 1981489615 - 2³ = 1981489607 is a prime.

It is a super-3 number, since 3×1981489615³ (a number of 29 digits) contains 333 as substring.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 947491 + ... + 949579.

It is an arithmetic number, because the mean of its divisors is an integer number (87165540).

Almost surely, 2^1981489615 is an apocalyptic number.

1981489615 is a deficient number, since it is larger than the sum of its proper divisors (807807665).

1981489615 is a wasteful number, since it uses less digits than its factorization.

1981489615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its digits is 622080, while the sum is 52.

The square root of 1981489615 is about 44513.9260793743. The cubic root of 1981489615 is about 1256.0220591197.

The spelling of 1981489615 in words is "one billion, nine hundred eighty-one million, four hundred eighty-nine thousand, six hundred fifteen".