2991739987 has 2 divisors, whose sum is σ = 2991739988. Its totient is φ = 2991739986.

The previous prime is 2991739939. The next prime is 2991740023. The reversal of 2991739987 is 7899371992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2991739987 - 2¹⁵ = 2991707219 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991739787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495869993 + 1495869994.

It is an arithmetic number, because the mean of its divisors is an integer number (1495869994).

Almost surely, 2^2991739987 is an apocalyptic number.

2991739987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991739987 is an equidigital number, since it uses as much as digits as its factorization.

2991739987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15431472, while the sum is 64.

The square root of 2991739987 is about 54696.8005188603. The cubic root of 2991739987 is about 1440.9246869231.

The spelling of 2991739987 in words is "two billion, nine hundred ninety-one million, seven hundred thirty-nine thousand, nine hundred eighty-seven".