189961641 has 6 divisors (see below), whose sum is σ = 274389050. Its totient is φ = 126641088.

The previous prime is 189961637. The next prime is 189961643. The reversal of 189961641 is 146169981.

189961641 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 only one way, i.e., 148937616 + 41024025 = 12204^2 + 6405^2 .

It is not a de Polignac number, because 189961641 - 2² = 189961637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189961643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10553416 + ... + 10553433.

Almost surely, 2^189961641 is an apocalyptic number.

It is an amenable number.

189961641 is a deficient number, since it is larger than the sum of its proper divisors (84427409).

189961641 is a wasteful number, since it uses less digits than its factorization.

189961641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21106855 (or 21106852 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 189961641 is about 13782.6572546806. The cubic root of 189961641 is about 574.8510172304.

The spelling of 189961641 in words is "one hundred eighty-nine million, nine hundred sixty-one thousand, six hundred forty-one".