961881 has 4 divisors (see below), whose sum is σ = 1282512. Its totient is φ = 641252.

The previous prime is 961879. The next prime is 961927. The reversal of 961881 is 188169.

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: 188169 = 3 ⋅62723.

It is a cyclic number.

It is not a de Polignac number, because 961881 - 2¹ = 961879 is a prime.

It is a super-2 number, since 2×961881² = 1850430116322, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (961811) 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, 160311 + ... + 160316.

It is an arithmetic number, because the mean of its divisors is an integer number (320628).

2⁹⁶¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

961881 is a deficient number, since it is larger than the sum of its proper divisors (320631).

961881 is a wasteful number, since it uses less digits than its factorization.

961881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320630.

The product of its digits is 3456, while the sum is 33.

The square root of 961881 is about 980.7553211683. The cubic root of 961881 is about 98.7128707287.

The spelling of 961881 in words is "nine hundred sixty-one thousand, eight hundred eighty-one".