961555 has 16 divisors (see below), whose sum is σ = 1338624. Its totient is φ = 649440.

The previous prime is 961549. The next prime is 961567. The reversal of 961555 is 555169.

It is a happy number.

961555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 961555 - 2³ = 961547 is a prime.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2740 + ... + 3070.

It is an arithmetic number, because the mean of its divisors is an integer number (83664).

2⁹⁶¹⁵⁵⁵ is an apocalyptic number.

961555 is a deficient number, since it is larger than the sum of its proper divisors (377069).

961555 is a wasteful number, since it uses less digits than its factorization.

961555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426.

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

The square root of 961555 is about 980.5891086485. The cubic root of 961555 is about 98.7017175708.

It can be divided in two parts, 9615 and 55, that multiplied together give a palindrome (528825).

The spelling of 961555 in words is "nine hundred sixty-one thousand, five hundred fifty-five".