1721531016 has 32 divisors (see below), whose sum is σ = 4782031200. Its totient is φ = 573843600.

The previous prime is 1721531003. The next prime is 1721531017. The reversal of 1721531016 is 6101351271.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1721531017) 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, 3984810 + ... + 3985241.

It is an arithmetic number, because the mean of its divisors is an integer number (149438475).

Almost surely, 2^1721531016 is an apocalyptic number.

It is an amenable number.

1721531016 is an abundant number, since it is smaller than the sum of its proper divisors (3060500184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721531016 is a wasteful number, since it uses less digits than its factorization.

1721531016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7970066 (or 7970056 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1721531016 is about 41491.3366379055. The cubic root of 1721531016 is about 1198.5006774735.

Adding to 1721531016 its reverse (6101351271), we get a palindrome (7822882287).

The spelling of 1721531016 in words is "one billion, seven hundred twenty-one million, five hundred thirty-one thousand, sixteen".