190686161 has 8 divisors (see below), whose sum is σ = 202308840. Its totient is φ = 179108608.

The previous prime is 190686137. The next prime is 190686163. The reversal of 190686161 is 161686091.

It can be written as a sum of positive squares in 4 ways, for example, as 41357761 + 149328400 = 6431^2 + 12220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 190686161 - 2¹⁴ = 190669777 is a prime.

It is a super-2 number, since 2×190686161² = 72722423993835842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (190686163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2366 + ... + 19671.

It is an arithmetic number, because the mean of its divisors is an integer number (25288605).

Almost surely, 2^190686161 is an apocalyptic number.

It is an amenable number.

190686161 is a deficient number, since it is larger than the sum of its proper divisors (11622679).

190686161 is a wasteful number, since it uses less digits than its factorization.

190686161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22563.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 190686161 is about 13808.9159965582. The cubic root of 190686161 is about 575.5809236690.

The spelling of 190686161 in words is "one hundred ninety million, six hundred eighty-six thousand, one hundred sixty-one".