189631 has 8 divisors (see below), whose sum is σ = 211680. Its totient is φ = 168672.

The previous prime is 189619. The next prime is 189643. The reversal of 189631 is 136981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (189619) and next prime (189643).

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 189631 - 2⁵ = 189599 is a prime.

It is a super-2 number, since 2×189631² = 71919832322, which contains 22 as substring.

It is a Duffinian number.

189631 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 189631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189661) 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, 126 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2¹⁸⁹⁶³¹ is an apocalyptic number.

189631 is a deficient number, since it is larger than the sum of its proper divisors (22049).

189631 is a wasteful number, since it uses less digits than its factorization.

189631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 1296, while the sum is 28.

The square root of 189631 is about 435.4664166156. The cubic root of 189631 is about 57.4517301264.

Subtracting from 189631 its reverse (136981), we obtain a triangular number (52650 = T₃₂₄).

It can be divided in two parts, 189 and 631, that added together give a triangular number (820 = T₄₀).

The spelling of 189631 in words is "one hundred eighty-nine thousand, six hundred thirty-one".