1610536721 has 8 divisors (see below), whose sum is σ = 1667433600. Its totient is φ = 1553730640.

The previous prime is 1610536699. The next prime is 1610536723. The reversal of 1610536721 is 1276350161.

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 1610536721 - 2¹⁸ = 1610274577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1610536723) 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, 14456 + ... + 58566.

It is an arithmetic number, because the mean of its divisors is an integer number (208429200).

Almost surely, 2^1610536721 is an apocalyptic number.

It is an amenable number.

1610536721 is a deficient number, since it is larger than the sum of its proper divisors (56896879).

1610536721 is a wasteful number, since it uses less digits than its factorization.

1610536721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45399.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1610536721 is about 40131.4928827723. The cubic root of 1610536721 is about 1172.1689431061.

Adding to 1610536721 its reverse (1276350161), we get a palindrome (2886886882).

The spelling of 1610536721 in words is "one billion, six hundred ten million, five hundred thirty-six thousand, seven hundred twenty-one".