115961 has 4 divisors (see below), whose sum is σ = 117924. Its totient is φ = 114000.

The previous prime is 115933. The next prime is 115963. The reversal of 115961 is 169511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169511 = 337 ⋅503.

It can be written as a sum of positive squares in 2 ways, for example, as 6400 + 109561 = 80^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 115961 - 2¹⁴ = 99577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115963) 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, 890 + ... + 1011.

It is an arithmetic number, because the mean of its divisors is an integer number (29481).

2¹¹⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

115961 is a deficient number, since it is larger than the sum of its proper divisors (1963).

115961 is an equidigital number, since it uses as much as digits as its factorization.

115961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its digits is 270, while the sum is 23.

The square root of 115961 is about 340.5304685340. The cubic root of 115961 is about 48.7645233958.

The spelling of 115961 in words is "one hundred fifteen thousand, nine hundred sixty-one".