194309661 has 16 divisors (see below), whose sum is σ = 318867584. Its totient is φ = 102492864.

The previous prime is 194309659. The next prime is 194309699. The reversal of 194309661 is 166903491.

It is not a de Polignac number, because 194309661 - 2¹ = 194309659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is the 13940-th Hogben number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194309611) by changing a digit.

It is a nontrivial repunit in base 13939.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355606 + ... + 356151.

It is an arithmetic number, because the mean of its divisors is an integer number (19929224).

Almost surely, 2^194309661 is an apocalyptic number.

It is an amenable number.

194309661 is a deficient number, since it is larger than the sum of its proper divisors (124557923).

194309661 is a wasteful number, since it uses less digits than its factorization.

194309661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711780.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 194309661 is about 13939.5000269020. The cubic root of 194309661 is about 579.2038829652.

The spelling of 194309661 in words is "one hundred ninety-four million, three hundred nine thousand, six hundred sixty-one".