189898961 has 12 divisors (see below), whose sum is σ = 221864292. Its totient is φ = 162062208.

The previous prime is 189898949. The next prime is 189898967. The reversal of 189898961 is 169898981.

It can be written as a sum of positive squares in 2 ways, for example, as 32547025 + 157351936 = 5705^2 + 12544^2 .

It is not a de Polignac number, because 189898961 - 2⁶ = 189898897 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 189898961.

It is not an unprimeable number, because it can be changed into a prime (189898967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3101 + ... + 19733.

It is an arithmetic number, because the mean of its divisors is an integer number (18488691).

Almost surely, 2^189898961 is an apocalyptic number.

It is an amenable number.

189898961 is a deficient number, since it is larger than the sum of its proper divisors (31965331).

189898961 is a wasteful number, since it uses less digits than its factorization.

189898961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16880 (or 16873 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 59.

The square root of 189898961 is about 13780.3831949623. The cubic root of 189898961 is about 574.7877840687.

The spelling of 189898961 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred sixty-one".