15883812961 has 3 divisors (see below), whose sum is σ = 15883938993. Its totient is φ = 15883686930.

The previous prime is 15883812947. The next prime is 15883813007. The reversal of 15883812961 is 16921838851.

The square root of 15883812961 is 126031.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16921838851 = 4967 ⋅3406853.

It is not a de Polignac number, because 15883812961 - 2¹⁷ = 15883681889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15883812899 and 15883812908.

It is not an unprimeable number, because it can be changed into a prime (15883812361) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63016 + ... + 189046.

It is an arithmetic number, because the mean of its divisors is an integer number (5294646331).

Almost surely, 2^15883812961 is an apocalyptic number.

15883812961 is the 126031-st square number.

15883812961 is the 63016-th centered octagonal number.

It is an amenable number.

15883812961 is a deficient number, since it is larger than the sum of its proper divisors (126032).

15883812961 is an frugal number, since it uses more digits than its factorization.

15883812961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252062 (or 126031 counting only the distinct ones).

The product of its digits is 829440, while the sum is 52.

The spelling of 15883812961 in words is "fifteen billion, eight hundred eighty-three million, eight hundred twelve thousand, nine hundred sixty-one".