1720315057 has 2 divisors, whose sum is σ = 1720315058. Its totient is φ = 1720315056.

The previous prime is 1720315049. The next prime is 1720315099. The reversal of 1720315057 is 7505130271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1683542961 + 36772096 = 41031^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720315057 - 2³ = 1720315049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720315027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860157528 + 860157529.

It is an arithmetic number, because the mean of its divisors is an integer number (860157529).

Almost surely, 2^1720315057 is an apocalyptic number.

It is an amenable number.

1720315057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720315057 is an equidigital number, since it uses as much as digits as its factorization.

1720315057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 1720315057 is about 41476.6808821535. The cubic root of 1720315057 is about 1198.2184343380.

The spelling of 1720315057 in words is "one billion, seven hundred twenty million, three hundred fifteen thousand, fifty-seven".