189413603261 has 4 divisors (see below), whose sum is σ = 189475729500. Its totient is φ = 189351477024.

The previous prime is 189413603251. The next prime is 189413603279. The reversal of 189413603261 is 162306314981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81185104900 + 108228498361 = 284930^2 + 328981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189413603261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189413603251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31058546 + ... + 31064643.

It is an arithmetic number, because the mean of its divisors is an integer number (47368932375).

Almost surely, 2^189413603261 is an apocalyptic number.

It is an amenable number.

189413603261 is a deficient number, since it is larger than the sum of its proper divisors (62126239).

189413603261 is an equidigital number, since it uses as much as digits as its factorization.

189413603261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62126238.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 189413603261 in words is "one hundred eighty-nine billion, four hundred thirteen million, six hundred three thousand, two hundred sixty-one".