1720743601 has 4 divisors (see below), whose sum is σ = 1722693232. Its totient is φ = 1718793972.

The previous prime is 1720743589. The next prime is 1720743641. The reversal of 1720743601 is 1063470271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1720743601 - 2¹¹ = 1720741553 is a prime.

It is a super-3 number, since 3×1720743601³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720743641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973491 + ... + 975256.

It is an arithmetic number, because the mean of its divisors is an integer number (430673308).

Almost surely, 2^1720743601 is an apocalyptic number.

It is an amenable number.

1720743601 is a deficient number, since it is larger than the sum of its proper divisors (1949631).

1720743601 is an equidigital number, since it uses as much as digits as its factorization.

1720743601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949630.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 1720743601 is about 41481.8466440442. The cubic root of 1720743601 is about 1198.3179212869.

It can be divided in two parts, 1720743 and 601, that added together give a square (1721344 = 1312²).

The spelling of 1720743601 in words is "one billion, seven hundred twenty million, seven hundred forty-three thousand, six hundred one".