189521145 has 24 divisors (see below), whose sum is σ = 358368192. Its totient is φ = 91888800.

The previous prime is 189521113. The next prime is 189521161. The reversal of 189521145 is 541125981.

It is not a de Polignac number, because 189521145 - 2⁵ = 189521113 is a prime.

It is a super-2 number, since 2×189521145² = 71836528804222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190941 + ... + 191930.

It is an arithmetic number, because the mean of its divisors is an integer number (14932008).

Almost surely, 2^189521145 is an apocalyptic number.

189521145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189521145 is a deficient number, since it is larger than the sum of its proper divisors (168847047).

189521145 is a wasteful number, since it uses less digits than its factorization.

189521145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382893 (or 382890 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 189521145 is about 13766.6678974979. The cubic root of 189521145 is about 574.4063387636.

The spelling of 189521145 in words is "one hundred eighty-nine million, five hundred twenty-one thousand, one hundred forty-five".