155953 has 4 divisors (see below), whose sum is σ = 178240. Its totient is φ = 133668.

The previous prime is 155921. The next prime is 156007. The reversal of 155953 is 359551.

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 an emirpimes, since its reverse is a distinct semiprime: 359551 = 167 ⋅2153.

It is a cyclic number.

It is not a de Polignac number, because 155953 - 2⁵ = 155921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11133 + ... + 11146.

It is an arithmetic number, because the mean of its divisors is an integer number (44560).

2¹⁵⁵⁹⁵³ is an apocalyptic number.

It is an amenable number.

155953 is a deficient number, since it is larger than the sum of its proper divisors (22287).

155953 is an equidigital number, since it uses as much as digits as its factorization.

155953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22286.

The product of its digits is 3375, while the sum is 28.

The square root of 155953 is about 394.9088502427. The cubic root of 155953 is about 53.8267193601.

The spelling of 155953 in words is "one hundred fifty-five thousand, nine hundred fifty-three".