1720607231 has 4 divisors (see below), whose sum is σ = 1966408272. Its totient is φ = 1474806192.

The previous prime is 1720607227. The next prime is 1720607233. The reversal of 1720607231 is 1327060271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1327060271 = 29 ⋅45760699.

It is a cyclic number.

It is not a de Polignac number, because 1720607231 - 2² = 1720607227 is a prime.

It is a super-2 number, since 2×1720607231² = 5920978486738974722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720607194 and 1720607203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720607233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122900510 + ... + 122900523.

It is an arithmetic number, because the mean of its divisors is an integer number (491602068).

Almost surely, 2^1720607231 is an apocalyptic number.

1720607231 is a deficient number, since it is larger than the sum of its proper divisors (245801041).

1720607231 is an equidigital number, since it uses as much as digits as its factorization.

1720607231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245801040.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 1720607231 is about 41480.2028804103. The cubic root of 1720607231 is about 1198.2862646373.

The spelling of 1720607231 in words is "one billion, seven hundred twenty million, six hundred seven thousand, two hundred thirty-one".