1561210113 has 8 divisors (see below), whose sum is σ = 2204061408. Its totient is φ = 979582784.

The previous prime is 1561210051. The next prime is 1561210117. The reversal of 1561210113 is 3110121651.

It is a happy number.

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 1561210113 - 2²⁵ = 1527655681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561210113.

It is not an unprimeable number, because it can be changed into a prime (1561210117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15305931 + ... + 15306032.

It is an arithmetic number, because the mean of its divisors is an integer number (275507676).

Almost surely, 2^1561210113 is an apocalyptic number.

It is an amenable number.

1561210113 is a deficient number, since it is larger than the sum of its proper divisors (642851295).

1561210113 is a wasteful number, since it uses less digits than its factorization.

1561210113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30611983.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1561210113 is about 39512.1514600256. The cubic root of 1561210113 is about 1160.0778071571.

Adding to 1561210113 its reverse (3110121651), we get a palindrome (4671331764).

The spelling of 1561210113 in words is "one billion, five hundred sixty-one million, two hundred ten thousand, one hundred thirteen".