153961 has 4 divisors (see below), whose sum is σ = 159300. Its totient is φ = 148624.

The previous prime is 153953. The next prime is 153991. The reversal of 153961 is 169351.

153961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27225 + 126736 = 165^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 153961 - 2³ = 153953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153911) 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, 2626 + ... + 2683.

It is an arithmetic number, because the mean of its divisors is an integer number (39825).

2¹⁵³⁹⁶¹ is an apocalyptic number.

It is an amenable number.

153961 is a deficient number, since it is larger than the sum of its proper divisors (5339).

153961 is an equidigital number, since it uses as much as digits as its factorization.

153961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338.

The product of its digits is 810, while the sum is 25.

The square root of 153961 is about 392.3786436594. The cubic root of 153961 is about 53.5965589608.

It can be divided in two parts, 1539 and 61, that added together give a square (1600 = 40²).

The spelling of 153961 in words is "one hundred fifty-three thousand, nine hundred sixty-one".