961553 has 8 divisors (see below), whose sum is σ = 1010880. Its totient is φ = 913360.

The previous prime is 961549. The next prime is 961567. The reversal of 961553 is 355169.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 961553 - 2² = 961549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (961453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1826 + ... + 2292.

It is an arithmetic number, because the mean of its divisors is an integer number (126360).

2⁹⁶¹⁵⁵³ is an apocalyptic number.

It is an amenable number.

961553 is a deficient number, since it is larger than the sum of its proper divisors (49327).

961553 is a wasteful number, since it uses less digits than its factorization.

961553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567.

The product of its digits is 4050, while the sum is 29.

The square root of 961553 is about 980.5880888528. The cubic root of 961553 is about 98.7016491387.

The spelling of 961553 in words is "nine hundred sixty-one thousand, five hundred fifty-three".