1720831613 has 16 divisors (see below), whose sum is σ = 1878883776. Its totient is φ = 1569834240.

The previous prime is 1720831603. The next prime is 1720831621. The reversal of 1720831613 is 3161380271.

It is a cyclic number.

It is not a de Polignac number, because 1720831613 - 2¹² = 1720827517 is a prime.

It is a super-2 number, since 2×1720831613² = 5922522880600363538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720831613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720831603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63278 + ... + 86288.

It is an arithmetic number, because the mean of its divisors is an integer number (117430236).

Almost surely, 2^1720831613 is an apocalyptic number.

It is an amenable number.

1720831613 is a deficient number, since it is larger than the sum of its proper divisors (158052163).

1720831613 is a wasteful number, since it uses less digits than its factorization.

1720831613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23164.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1720831613 is about 41482.9074800694. The cubic root of 1720831613 is about 1198.3383513225.

The spelling of 1720831613 in words is "one billion, seven hundred twenty million, eight hundred thirty-one thousand, six hundred thirteen".