188533961 has 32 divisors (see below), whose sum is σ = 252419328. Its totient is φ = 136304640.

The previous prime is 188533937. The next prime is 188533963. The reversal of 188533961 is 169335881.

It is not a de Polignac number, because 188533961 - 2¹⁰ = 188532937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (188533963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94571 + ... + 96543.

It is an arithmetic number, because the mean of its divisors is an integer number (7888104).

Almost surely, 2^188533961 is an apocalyptic number.

188533961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

188533961 is a deficient number, since it is larger than the sum of its proper divisors (63885367).

188533961 is a wasteful number, since it uses less digits than its factorization.

188533961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081.

The product of its digits is 155520, while the sum is 44.

The square root of 188533961 is about 13730.7669487178. The cubic root of 188533961 is about 573.4072731918.

The spelling of 188533961 in words is "one hundred eighty-eight million, five hundred thirty-three thousand, nine hundred sixty-one".