1720225831 has 2 divisors, whose sum is σ = 1720225832. Its totient is φ = 1720225830.

The previous prime is 1720225757. The next prime is 1720225847. The reversal of 1720225831 is 1385220271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1720225831 - 2¹¹ = 1720223783 is a prime.

It is a super-2 number, since 2×1720225831² = 5918353819279281122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1720225793 and 1720225802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720225891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860112915 + 860112916.

It is an arithmetic number, because the mean of its divisors is an integer number (860112916).

Almost surely, 2^1720225831 is an apocalyptic number.

1720225831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720225831 is an equidigital number, since it uses as much as digits as its factorization.

1720225831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1720225831 is about 41475.6052517621. The cubic root of 1720225831 is about 1198.1977183484.

The spelling of 1720225831 in words is "one billion, seven hundred twenty million, two hundred twenty-five thousand, eight hundred thirty-one".