19661153 has 4 divisors (see below), whose sum is σ = 19674288. Its totient is φ = 19648020.

The previous prime is 19661137. The next prime is 19661207. The reversal of 19661153 is 35116691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19661153 - 2⁴ = 19661137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19661053) 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, 3983 + ... + 7428.

It is an arithmetic number, because the mean of its divisors is an integer number (4918572).

Almost surely, 2^19661153 is an apocalyptic number.

It is an amenable number.

19661153 is a deficient number, since it is larger than the sum of its proper divisors (13135).

19661153 is a wasteful number, since it uses less digits than its factorization.

19661153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13134.

The product of its digits is 4860, while the sum is 32.

The square root of 19661153 is about 4434.0898727924. The cubic root of 19661153 is about 269.9000681849.

The spelling of 19661153 in words is "nineteen million, six hundred sixty-one thousand, one hundred fifty-three".