161357 has 12 divisors (see below), whose sum is σ = 194940. Its totient is φ = 133056.

The previous prime is 161341. The next prime is 161363. The reversal of 161357 is 753161.

It can be written as a sum of positive squares in 2 ways, for example, as 90601 + 70756 = 301^2 + 266^2 .

It is not a de Polignac number, because 161357 - 2⁴ = 161341 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 (161377) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1769 + ... + 1857.

It is an arithmetic number, because the mean of its divisors is an integer number (16245).

2¹⁶¹³⁵⁷ is an apocalyptic number.

It is an amenable number.

161357 is a deficient number, since it is larger than the sum of its proper divisors (33583).

161357 is an equidigital number, since it uses as much as digits as its factorization.

161357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 133 counting only the distinct ones).

The product of its digits is 630, while the sum is 23.

The square root of 161357 is about 401.6926685913. The cubic root of 161357 is about 54.4413981667.

It can be divided in two parts, 16 and 1357, that multiplied together give a palindrome (21712).

The spelling of 161357 in words is "one hundred sixty-one thousand, three hundred fifty-seven".