1720222231 has 64 divisors (see below), whose sum is σ = 2334044160. Its totient is φ = 1229414400.

The previous prime is 1720222211. The next prime is 1720222243. The reversal of 1720222231 is 1322220271.

It is a cyclic number.

It is not a de Polignac number, because 1720222231 - 2⁷ = 1720222103 is a prime.

It is a super-2 number, since 2×1720222231² = 5918329048053234722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720222211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4289631 + ... + 4290031.

It is an arithmetic number, because the mean of its divisors is an integer number (36469440).

Almost surely, 2^1720222231 is an apocalyptic number.

1720222231 is a deficient number, since it is larger than the sum of its proper divisors (613821929).

1720222231 is a wasteful number, since it uses less digits than its factorization.

1720222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1720222231 is about 41475.5618527344. The cubic root of 1720222231 is about 1198.1968825057.

The spelling of 1720222231 in words is "one billion, seven hundred twenty million, two hundred twenty-two thousand, two hundred thirty-one".