610863721 has 8 divisors (see below), whose sum is σ = 661264520. Its totient is φ = 560950272.

The previous prime is 610863709. The next prime is 610863791. The reversal of 610863721 is 127368016.

It can be written as a sum of positive squares in 4 ways, for example, as 9388096 + 601475625 = 3064^2 + 24525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 610863721 - 2⁵ = 610863689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (610863791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119226 + ... + 124243.

It is an arithmetic number, because the mean of its divisors is an integer number (82658065).

Almost surely, 2^610863721 is an apocalyptic number.

It is an amenable number.

610863721 is a deficient number, since it is larger than the sum of its proper divisors (50400799).

610863721 is a wasteful number, since it uses less digits than its factorization.

610863721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243675.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 610863721 is about 24715.6574057823. The cubic root of 610863721 is about 848.4927017102.

The spelling of 610863721 in words is "six hundred ten million, eight hundred sixty-three thousand, seven hundred twenty-one".