2891236487 has 2 divisors, whose sum is σ = 2891236488. Its totient is φ = 2891236486.

The previous prime is 2891236477. The next prime is 2891236489. The reversal of 2891236487 is 7846321982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2891236487 - 2⁶ = 2891236423 is a prime.

Together with 2891236489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891236489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445618243 + 1445618244.

It is an arithmetic number, because the mean of its divisors is an integer number (1445618244).

Almost surely, 2^2891236487 is an apocalyptic number.

2891236487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891236487 is an equidigital number, since it uses as much as digits as its factorization.

2891236487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The square root of 2891236487 is about 53770.2193318941. The cubic root of 2891236487 is about 1424.6052440141.

The spelling of 2891236487 in words is "two billion, eight hundred ninety-one million, two hundred thirty-six thousand, four hundred eighty-seven".