19290661 has 8 divisors (see below), whose sum is σ = 21009240. Its totient is φ = 17605632.

The previous prime is 19290659. The next prime is 19290673. The reversal of 19290661 is 16609291.

It can be written as a sum of positive squares in 4 ways, for example, as 1600225 + 17690436 = 1265^2 + 4206^2 .

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 19290661 - 2¹ = 19290659 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 (19291661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7180 + ... + 9493.

It is an arithmetic number, because the mean of its divisors is an integer number (2626155).

Almost surely, 2^19290661 is an apocalyptic number.

It is an amenable number.

19290661 is a deficient number, since it is larger than the sum of its proper divisors (1718579).

19290661 is a wasteful number, since it uses less digits than its factorization.

19290661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16775.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 19290661 is about 4392.1135003549. The cubic root of 19290661 is about 268.1939868635.

The spelling of 19290661 in words is "nineteen million, two hundred ninety thousand, six hundred sixty-one".