4721657 has 2 divisors, whose sum is σ = 4721658. Its totient is φ = 4721656.

The previous prime is 4721653. The next prime is 4721659. The reversal of 4721657 is 7561274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4280761 + 440896 = 2069^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 4721657 - 2² = 4721653 is a prime.

Together with 4721659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4721653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360828 + 2360829.

It is an arithmetic number, because the mean of its divisors is an integer number (2360829).

Almost surely, 2^4721657 is an apocalyptic number.

It is an amenable number.

4721657 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721657 is an equidigital number, since it uses as much as digits as its factorization.

4721657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 32.

The square root of 4721657 is about 2172.9374128124. The cubic root of 4721657 is about 167.7637576142.

The spelling of 4721657 in words is "four million, seven hundred twenty-one thousand, six hundred fifty-seven".