190644481 has 4 divisors (see below), whose sum is σ = 190679764. Its totient is φ = 190609200.

The previous prime is 190644473. The next prime is 190644491. The reversal of 190644481 is 184446091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80730225 + 109914256 = 8985^2 + 10484^2 .

It is a cyclic number.

It is not a de Polignac number, because 190644481 - 2³ = 190644473 is a prime.

It is a super-2 number, since 2×190644481² = 72690636271518722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 190644481.

It is not an unprimeable number, because it can be changed into a prime (190644491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7650 + ... + 20971.

It is an arithmetic number, because the mean of its divisors is an integer number (47669941).

Almost surely, 2^190644481 is an apocalyptic number.

It is an amenable number.

190644481 is a deficient number, since it is larger than the sum of its proper divisors (35283).

190644481 is an equidigital number, since it uses as much as digits as its factorization.

190644481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35282.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 190644481 is about 13807.4067442080. The cubic root of 190644481 is about 575.5389839693.

The spelling of 190644481 in words is "one hundred ninety million, six hundred forty-four thousand, four hundred eighty-one".