610696721 has 4 divisors (see below), whose sum is σ = 611537472. Its totient is φ = 609855972.

The previous prime is 610696693. The next prime is 610696733. The reversal of 610696721 is 127696016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 610696721 - 2⁶ = 610696657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (610696741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419285 + ... + 420738.

It is an arithmetic number, because the mean of its divisors is an integer number (152884368).

Almost surely, 2^610696721 is an apocalyptic number.

It is an amenable number.

610696721 is a deficient number, since it is larger than the sum of its proper divisors (840751).

610696721 is an equidigital number, since it uses as much as digits as its factorization.

610696721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840750.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 610696721 is about 24712.2787496418. The cubic root of 610696721 is about 848.4153733902.

The spelling of 610696721 in words is "six hundred ten million, six hundred ninety-six thousand, seven hundred twenty-one".