2563491787 has 2 divisors, whose sum is σ = 2563491788. Its totient is φ = 2563491786.

The previous prime is 2563491737. The next prime is 2563491811. The reversal of 2563491787 is 7871943652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2563491787 - 2¹⁹ = 2562967499 is a prime.

It is not a weakly prime, because it can be changed into another prime (2563491737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281745893 + 1281745894.

It is an arithmetic number, because the mean of its divisors is an integer number (1281745894).

Almost surely, 2^2563491787 is an apocalyptic number.

2563491787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2563491787 is an equidigital number, since it uses as much as digits as its factorization.

2563491787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The square root of 2563491787 is about 50630.9370543347. The cubic root of 2563491787 is about 1368.6024405831.

The spelling of 2563491787 in words is "two billion, five hundred sixty-three million, four hundred ninety-one thousand, seven hundred eighty-seven".