1617139987 has 8 divisors (see below), whose sum is σ = 1634098752. Its totient is φ = 1600200000.

The previous prime is 1617139973. The next prime is 1617140029. The reversal of 1617139987 is 7899317161.

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 1617139987 - 2¹¹ = 1617137939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617139907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227487 + ... + 234487.

It is an arithmetic number, because the mean of its divisors is an integer number (204262344).

Almost surely, 2^1617139987 is an apocalyptic number.

1617139987 is a deficient number, since it is larger than the sum of its proper divisors (16958765).

1617139987 is a wasteful number, since it uses less digits than its factorization.

1617139987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9389.

The product of its digits is 571536, while the sum is 52.

The square root of 1617139987 is about 40213.6791030117. The cubic root of 1617139987 is about 1173.7687387842.

The spelling of 1617139987 in words is "one billion, six hundred seventeen million, one hundred thirty-nine thousand, nine hundred eighty-seven".