1721675057 has 2 divisors, whose sum is σ = 1721675058. Its totient is φ = 1721675056.

The previous prime is 1721675003. The next prime is 1721675089. The reversal of 1721675057 is 7505761271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188249841 + 533425216 = 34471^2 + 23096^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721675057 - 2¹² = 1721670961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721675257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860837528 + 860837529.

It is an arithmetic number, because the mean of its divisors is an integer number (860837529).

Almost surely, 2^1721675057 is an apocalyptic number.

It is an amenable number.

1721675057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721675057 is an equidigital number, since it uses as much as digits as its factorization.

1721675057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102900, while the sum is 41.

The square root of 1721675057 is about 41493.0723976907. The cubic root of 1721675057 is about 1198.5341028412.

The spelling of 1721675057 in words is "one billion, seven hundred twenty-one million, six hundred seventy-five thousand, fifty-seven".