961885821 has 8 divisors (see below), whose sum is σ = 1381169440. Its totient is φ = 591929712.

The previous prime is 961885819. The next prime is 961885861. The reversal of 961885821 is 128588169.

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

It is not a de Polignac number, because 961885821 - 2¹ = 961885819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961885861) 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, 12331831 + ... + 12331908.

It is an arithmetic number, because the mean of its divisors is an integer number (172646180).

Almost surely, 2^961885821 is an apocalyptic number.

It is an amenable number.

961885821 is a deficient number, since it is larger than the sum of its proper divisors (419283619).

961885821 is a wasteful number, since it uses less digits than its factorization.

961885821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24663755.

The product of its digits is 276480, while the sum is 48.

The square root of 961885821 is about 31014.2841445680. The cubic root of 961885821 is about 987.1303564652.

The spelling of 961885821 in words is "nine hundred sixty-one million, eight hundred eighty-five thousand, eight hundred twenty-one".