555961 has 4 divisors (see below), whose sum is σ = 635392. Its totient is φ = 476532.

The previous prime is 555953. The next prime is 555967. The reversal of 555961 is 169555.

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 an emirpimes, since its reverse is a distinct semiprime: 169555 = 5 ⋅33911.

It is not a de Polignac number, because 555961 - 2³ = 555953 is a prime.

It is a Duffinian number.

555961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (555967) 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, 39705 + ... + 39718.

It is an arithmetic number, because the mean of its divisors is an integer number (158848).

2⁵⁵⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

555961 is a deficient number, since it is larger than the sum of its proper divisors (79431).

555961 is an equidigital number, since it uses as much as digits as its factorization.

555961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79430.

The product of its digits is 6750, while the sum is 31.

The square root of 555961 is about 745.6279232969. The cubic root of 555961 is about 82.2270625211.

The spelling of 555961 in words is "five hundred fifty-five thousand, nine hundred sixty-one".