162157789 has 4 divisors (see below), whose sum is σ = 162183456. Its totient is φ = 162132124.

The previous prime is 162157777. The next prime is 162157841. The reversal of 162157789 is 987751261.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 162157789 - 2⁵ = 162157757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162157189) 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, 4032 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (40545864).

It is a 6318-hyperperfect number.

Almost surely, 2^162157789 is an apocalyptic number.

It is an amenable number.

162157789 is a deficient number, since it is larger than the sum of its proper divisors (25667).

162157789 is a wasteful number, since it uses less digits than its factorization.

162157789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25666.

The product of its digits is 211680, while the sum is 46.

The square root of 162157789 is about 12734.1190900667. The cubic root of 162157789 is about 545.3131090855.

The spelling of 162157789 in words is "one hundred sixty-two million, one hundred fifty-seven thousand, seven hundred eighty-nine".