1561216353 has 8 divisors (see below), whose sum is σ = 2083680768. Its totient is φ = 1039781424.

The previous prime is 1561216313. The next prime is 1561216381. The reversal of 1561216353 is 3536121651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561216353 - 2⁶ = 1561216289 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561216313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253825 + ... + 259902.

It is an arithmetic number, because the mean of its divisors is an integer number (260460096).

Almost surely, 2^1561216353 is an apocalyptic number.

It is an amenable number.

1561216353 is a deficient number, since it is larger than the sum of its proper divisors (522464415).

1561216353 is a wasteful number, since it uses less digits than its factorization.

1561216353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514743.

The product of its digits is 16200, while the sum is 33.

The square root of 1561216353 is about 39512.2304229969. The cubic root of 1561216353 is about 1160.0793527265.

The spelling of 1561216353 in words is "one billion, five hundred sixty-one million, two hundred sixteen thousand, three hundred fifty-three".