1720097957 has 2 divisors, whose sum is σ = 1720097958. Its totient is φ = 1720097956.

The previous prime is 1720097933. The next prime is 1720097983. The reversal of 1720097957 is 7597900271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1440506116 + 279591841 = 37954^2 + 16721^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720097957 - 2¹⁰ = 1720096933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720097557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860048978 + 860048979.

It is an arithmetic number, because the mean of its divisors is an integer number (860048979).

Almost surely, 2^1720097957 is an apocalyptic number.

It is an amenable number.

1720097957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720097957 is an equidigital number, since it uses as much as digits as its factorization.

1720097957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 277830, while the sum is 47.

The square root of 1720097957 is about 41474.0636663445. The cubic root of 1720097957 is about 1198.1680280351.

The spelling of 1720097957 in words is "one billion, seven hundred twenty million, ninety-seven thousand, nine hundred fifty-seven".