19661461 has 4 divisors (see below), whose sum is σ = 19680300. Its totient is φ = 19642624.

The previous prime is 19661443. The next prime is 19661483. The reversal of 19661461 is 16416691.

It is a happy number.

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 5267025 + 14394436 = 2295^2 + 3794^2 .

It is a 4-Lehmer number, since φ(19661461) divides (19661461-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 19661461 - 2⁵ = 19661429 is a prime.

It is a deceptive number, since it divides R_19661460.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661491) 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, 7756 + ... + 9973.

It is an arithmetic number, because the mean of its divisors is an integer number (4920075).

Almost surely, 2^19661461 is an apocalyptic number.

It is an amenable number.

19661461 is a deficient number, since it is larger than the sum of its proper divisors (18839).

19661461 is a wasteful number, since it uses less digits than its factorization.

19661461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18838.

The product of its digits is 7776, while the sum is 34.

The square root of 19661461 is about 4434.1246035717. The cubic root of 19661461 is about 269.9014775425.

The spelling of 19661461 in words is "nineteen million, six hundred sixty-one thousand, four hundred sixty-one".