1957268609 has 4 divisors (see below), whose sum is σ = 2024760660. Its totient is φ = 1889776560.

The previous prime is 1957268581. The next prime is 1957268623. The reversal of 1957268609 is 9068627591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1305232384 + 652036225 = 36128^2 + 25535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1957268609 - 2⁸ = 1957268353 is a prime.

It is a super-3 number, since 3×1957268609³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1957268699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33745982 + ... + 33746039.

It is an arithmetic number, because the mean of its divisors is an integer number (506190165).

Almost surely, 2^1957268609 is an apocalyptic number.

It is an amenable number.

1957268609 is a deficient number, since it is larger than the sum of its proper divisors (67492051).

1957268609 is an equidigital number, since it uses as much as digits as its factorization.

1957268609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67492050.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 1957268609 is about 44241.0285707735. The cubic root of 1957268609 is about 1250.8833455335.

The spelling of 1957268609 in words is "one billion, nine hundred fifty-seven million, two hundred sixty-eight thousand, six hundred nine".