857120169 has 4 divisors (see below), whose sum is σ = 1142826896. Its totient is φ = 571413444.

The previous prime is 857120137. The next prime is 857120171. The reversal of 857120169 is 961021758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 857120169 - 2⁵ = 857120137 is a prime.

It is a super-2 number, since 2×857120169² = 1469309968213177122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857120669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142853359 + ... + 142853364.

It is an arithmetic number, because the mean of its divisors is an integer number (285706724).

Almost surely, 2^857120169 is an apocalyptic number.

It is an amenable number.

857120169 is a deficient number, since it is larger than the sum of its proper divisors (285706727).

857120169 is a wasteful number, since it uses less digits than its factorization.

857120169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285706726.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 857120169 is about 29276.6147120872. The cubic root of 857120169 is about 949.9058702673.

The spelling of 857120169 in words is "eight hundred fifty-seven million, one hundred twenty thousand, one hundred sixty-nine".