1721099652 has 24 divisors (see below), whose sum is σ = 4252129056. Its totient is φ = 539952768.

The previous prime is 1721099647. The next prime is 1721099701. The reversal of 1721099652 is 2569901271.

It is a super-2 number, since 2×1721099652² = 5924368024229042208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4218178 + ... + 4218585.

It is an arithmetic number, because the mean of its divisors is an integer number (177172044).

Almost surely, 2^1721099652 is an apocalyptic number.

1721099652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721099652 is an abundant number, since it is smaller than the sum of its proper divisors (2531029404).

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

1721099652 is a wasteful number, since it uses less digits than its factorization.

1721099652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436787 (or 8436785 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 1721099652 is about 41486.1380704447. The cubic root of 1721099652 is about 1198.4005663460.

The spelling of 1721099652 in words is "one billion, seven hundred twenty-one million, ninety-nine thousand, six hundred fifty-two".