610788721 has 2 divisors, whose sum is σ = 610788722. Its totient is φ = 610788720.

The previous prime is 610788719. The next prime is 610788751. The reversal of 610788721 is 127887016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306635121 + 304153600 = 17511^2 + 17440^2 .

It is a cyclic number.

It is not a de Polignac number, because 610788721 - 2¹ = 610788719 is a prime.

Together with 610788719, it forms a pair of twin primes.

It is equal to p_31858483 and since 610788721 and 31858483 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (610788751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305394360 + 305394361.

It is an arithmetic number, because the mean of its divisors is an integer number (305394361).

Almost surely, 2^610788721 is an apocalyptic number.

It is an amenable number.

610788721 is a deficient number, since it is larger than the sum of its proper divisors (1).

610788721 is an equidigital number, since it uses as much as digits as its factorization.

610788721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 610788721 is about 24714.1401023786. The cubic root of 610788721 is about 848.4579751664.

The spelling of 610788721 in words is "six hundred ten million, seven hundred eighty-eight thousand, seven hundred twenty-one".