4721765987 has 2 divisors, whose sum is σ = 4721765988. Its totient is φ = 4721765986.

The previous prime is 4721765959. The next prime is 4721766053. The reversal of 4721765987 is 7895671274.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4721765987 is a prime.

It is not a weakly prime, because it can be changed into another prime (4721765927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360882993 + 2360882994.

It is an arithmetic number, because the mean of its divisors is an integer number (2360882994).

Almost surely, 2^4721765987 is an apocalyptic number.

4721765987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721765987 is an equidigital number, since it uses as much as digits as its factorization.

4721765987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 56.

The square root of 4721765987 is about 68715.1074145999. The cubic root of 4721765987 is about 1677.6504839892.

The spelling of 4721765987 in words is "four billion, seven hundred twenty-one million, seven hundred sixty-five thousand, nine hundred eighty-seven".