6601831987 has 2 divisors, whose sum is σ = 6601831988. Its totient is φ = 6601831986.

The previous prime is 6601831939. The next prime is 6601831993. The reversal of 6601831987 is 7891381066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6601831987 - 2¹⁵ = 6601799219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6601831987.

It is not a weakly prime, because it can be changed into another prime (6601831927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300915993 + 3300915994.

It is an arithmetic number, because the mean of its divisors is an integer number (3300915994).

Almost surely, 2^6601831987 is an apocalyptic number.

6601831987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601831987 is an equidigital number, since it uses as much as digits as its factorization.

6601831987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 6601831987 is about 81251.6583646143. The cubic root of 6601831987 is about 1875.9509948624.

The spelling of 6601831987 in words is "six billion, six hundred one million, eight hundred thirty-one thousand, nine hundred eighty-seven".