189476861 has 4 divisors (see below), whose sum is σ = 216544992. Its totient is φ = 162408732.

The previous prime is 189476857. The next prime is 189476879. The reversal of 189476861 is 168674981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 168674981 = 607 ⋅277883.

It is a cyclic number.

It is not a de Polignac number, because 189476861 - 2² = 189476857 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 (189476801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13534055 + ... + 13534068.

It is an arithmetic number, because the mean of its divisors is an integer number (54136248).

Almost surely, 2^189476861 is an apocalyptic number.

It is an amenable number.

189476861 is a deficient number, since it is larger than the sum of its proper divisors (27068131).

189476861 is an equidigital number, since it uses as much as digits as its factorization.

189476861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27068130.

The product of its digits is 580608, while the sum is 50.

The square root of 189476861 is about 13765.0594259524. The cubic root of 189476861 is about 574.3615961892.

The spelling of 189476861 in words is "one hundred eighty-nine million, four hundred seventy-six thousand, eight hundred sixty-one".