9961515951 has 4 divisors (see below), whose sum is σ = 13282021272. Its totient is φ = 6641010632.

The previous prime is 9961515917. The next prime is 9961515961. The reversal of 9961515951 is 1595151699.

9961515951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9961515951 - 2⁶ = 9961515887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9961515894 and 9961515903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9961515961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1660252656 + ... + 1660252661.

It is an arithmetic number, because the mean of its divisors is an integer number (3320505318).

Almost surely, 2^9961515951 is an apocalyptic number.

9961515951 is a deficient number, since it is larger than the sum of its proper divisors (3320505321).

9961515951 is a wasteful number, since it uses less digits than its factorization.

9961515951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320505320.

The product of its digits is 546750, while the sum is 51.

The square root of 9961515951 is about 99807.3942701642. The cubic root of 9961515951 is about 2151.6674247985.

The spelling of 9961515951 in words is "nine billion, nine hundred sixty-one million, five hundred fifteen thousand, nine hundred fifty-one".