189806513 has 16 divisors (see below), whose sum is σ = 218045520. Its totient is φ = 163670016.

The previous prime is 189806489. The next prime is 189806543. The reversal of 189806513 is 315608981.

189806513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1787569 + 188018944 = 1337^2 + 13712^2 .

It is a de Polignac number, because none of the positive numbers 2^k-189806513 is a prime.

It is a super-3 number, since 3×189806513³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189806543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27143 + ... + 33411.

It is an arithmetic number, because the mean of its divisors is an integer number (13627845).

Almost surely, 2^189806513 is an apocalyptic number.

189806513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

189806513 is a deficient number, since it is larger than the sum of its proper divisors (28239007).

189806513 is a wasteful number, since it uses less digits than its factorization.

189806513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6436.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 189806513 is about 13777.0284531898. The cubic root of 189806513 is about 574.6944947986.

The spelling of 189806513 in words is "one hundred eighty-nine million, eight hundred six thousand, five hundred thirteen".