190291621 has 8 divisors (see below), whose sum is σ = 205136120. Its totient is φ = 175476672.

The previous prime is 190291597. The next prime is 190291637. The reversal of 190291621 is 126192091.

It can be written as a sum of positive squares in 4 ways, for example, as 53144100 + 137147521 = 7290^2 + 11711^2 .

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 190291621 - 2¹⁵ = 190258853 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 (190291681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7051 + ... + 20743.

It is an arithmetic number, because the mean of its divisors is an integer number (25642015).

Almost surely, 2^190291621 is an apocalyptic number.

It is an amenable number.

190291621 is a deficient number, since it is larger than the sum of its proper divisors (14844499).

190291621 is a wasteful number, since it uses less digits than its factorization.

190291621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14775.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 190291621 is about 13794.6229016962. The cubic root of 190291621 is about 575.1836801966.

The spelling of 190291621 in words is "one hundred ninety million, two hundred ninety-one thousand, six hundred twenty-one".