189525981 has 4 divisors (see below), whose sum is σ = 252701312. Its totient is φ = 126350652.

The previous prime is 189525967. The next prime is 189526027.

189525981 is nontrivially palindromic in base 10.

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.

It is not a de Polignac number, because 189525981 - 2¹⁰ = 189524957 is a prime.

It is a super-2 number, since 2×189525981² = 71840194948024722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189525981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189525901) 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, 31587661 + ... + 31587666.

It is an arithmetic number, because the mean of its divisors is an integer number (63175328).

Almost surely, 2^189525981 is an apocalyptic number.

It is an amenable number.

189525981 is a deficient number, since it is larger than the sum of its proper divisors (63175331).

189525981 is an equidigital number, since it uses as much as digits as its factorization.

189525981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63175330.

The product of its digits is 259200, while the sum is 48.

The square root of 189525981 is about 13766.8435380083. The cubic root of 189525981 is about 574.4112244197.

The spelling of 189525981 in words is "one hundred eighty-nine million, five hundred twenty-five thousand, nine hundred eighty-one".