1616144987 has 4 divisors (see below), whose sum is σ = 1616467776. Its totient is φ = 1615822200.

The previous prime is 1616144923. The next prime is 1616145017. The reversal of 1616144987 is 7894416161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7894416161 = 1019 ⋅7747219.

It is a cyclic number.

It is not a de Polignac number, because 1616144987 - 2⁶ = 1616144923 is a prime.

It is a super-2 number, since 2×1616144987² = 5223849238010460338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616144087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153764 + ... + 163937.

It is an arithmetic number, because the mean of its divisors is an integer number (404116944).

Almost surely, 2^1616144987 is an apocalyptic number.

1616144987 is a deficient number, since it is larger than the sum of its proper divisors (322789).

1616144987 is an equidigital number, since it uses as much as digits as its factorization.

1616144987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322788.

The product of its digits is 290304, while the sum is 47.

The square root of 1616144987 is about 40201.3057872502. The cubic root of 1616144987 is about 1173.5279557730.

The spelling of 1616144987 in words is "one billion, six hundred sixteen million, one hundred forty-four thousand, nine hundred eighty-seven".