1616812987 has 2 divisors, whose sum is σ = 1616812988. Its totient is φ = 1616812986.

The previous prime is 1616812921. The next prime is 1616813027. The reversal of 1616812987 is 7892186161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1616812987 - 2²⁷ = 1482595259 is a prime.

It is a super-2 number, since 2×1616812987² = 5228168469863724338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616812987.

It is not a weakly prime, because it can be changed into another prime (1616852987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808406493 + 808406494.

It is an arithmetic number, because the mean of its divisors is an integer number (808406494).

Almost surely, 2^1616812987 is an apocalyptic number.

1616812987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616812987 is an equidigital number, since it uses as much as digits as its factorization.

1616812987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 49.

The square root of 1616812987 is about 40209.6131167660. The cubic root of 1616812987 is about 1173.6896179795.

The spelling of 1616812987 in words is "one billion, six hundred sixteen million, eight hundred twelve thousand, nine hundred eighty-seven".