2391764887 has 2 divisors, whose sum is σ = 2391764888. Its totient is φ = 2391764886.

The previous prime is 2391764863. The next prime is 2391764891. The reversal of 2391764887 is 7884671932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2391764887 - 2⁷ = 2391764759 is a prime.

It is a super-2 number, since 2×2391764887² = 11441078549372245538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2391764827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195882443 + 1195882444.

It is an arithmetic number, because the mean of its divisors is an integer number (1195882444).

Almost surely, 2^2391764887 is an apocalyptic number.

2391764887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391764887 is an equidigital number, since it uses as much as digits as its factorization.

2391764887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The square root of 2391764887 is about 48905.6733620957. The cubic root of 2391764887 is about 1337.3327964274.

It can be divided in two parts, 23917 and 64887, that added together give a square (88804 = 298²).

The spelling of 2391764887 in words is "two billion, three hundred ninety-one million, seven hundred sixty-four thousand, eight hundred eighty-seven".