189951 has 4 divisors (see below), whose sum is σ = 253272. Its totient is φ = 126632.

The previous prime is 189949. The next prime is 189961. The reversal of 189951 is 159981.

189951 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159981 = 3 ⋅53327.

It is a cyclic number.

It is not a de Polignac number, because 189951 - 2¹ = 189949 is a prime.

It is a D-number.

189951 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189901) 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, 31656 + ... + 31661.

It is an arithmetic number, because the mean of its divisors is an integer number (63318).

2¹⁸⁹⁹⁵¹ is an apocalyptic number.

189951 is a deficient number, since it is larger than the sum of its proper divisors (63321).

189951 is an equidigital number, since it uses as much as digits as its factorization.

189951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63320.

The product of its digits is 3240, while the sum is 33.

The square root of 189951 is about 435.8336838749. The cubic root of 189951 is about 57.4840283302.

The spelling of 189951 in words is "one hundred eighty-nine thousand, nine hundred fifty-one".