1057189909 has 2 divisors, whose sum is σ = 1057189910. Its totient is φ = 1057189908.

The previous prime is 1057189901. The next prime is 1057189933. The reversal of 1057189909 is 9099817501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981882225 + 75307684 = 31335^2 + 8678^2 .

It is an emirp because it is prime and its reverse (9099817501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1057189909 - 2³ = 1057189901 is a prime.

It is a super-2 number, since 2×1057189909² = 2235301007382856562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1057189901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528594954 + 528594955.

It is an arithmetic number, because the mean of its divisors is an integer number (528594955).

Almost surely, 2^1057189909 is an apocalyptic number.

It is an amenable number.

1057189909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1057189909 is an equidigital number, since it uses as much as digits as its factorization.

1057189909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 1057189909 is about 32514.4569230366. The cubic root of 1057189909 is about 1018.7110172445.

The spelling of 1057189909 in words is "one billion, fifty-seven million, one hundred eighty-nine thousand, nine hundred nine".