2981631787 has 2 divisors, whose sum is σ = 2981631788. Its totient is φ = 2981631786.

The previous prime is 2981631773. The next prime is 2981631811. The reversal of 2981631787 is 7871361892.

2981631787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2981631787 is a prime.

It is a super-2 number, since 2×2981631787² = 17780256226497626738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2981631187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1490815893 + 1490815894.

It is an arithmetic number, because the mean of its divisors is an integer number (1490815894).

Almost surely, 2^2981631787 is an apocalyptic number.

2981631787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2981631787 is an equidigital number, since it uses as much as digits as its factorization.

2981631787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 2981631787 is about 54604.3202228542. The cubic root of 2981631787 is about 1439.3000370961.

The spelling of 2981631787 in words is "two billion, nine hundred eighty-one million, six hundred thirty-one thousand, seven hundred eighty-seven".