9951859061 has 4 divisors (see below), whose sum is σ = 9993153324. Its totient is φ = 9910564800.

The previous prime is 9951859039. The next prime is 9951859067. The reversal of 9951859061 is 1609581599.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4458232900 + 5493626161 = 66770^2 + 74119^2 .

It is a cyclic number.

It is not a de Polignac number, because 9951859061 - 2¹⁸ = 9951596917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9951858994 and 9951859012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9951859067) 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, 20646770 + ... + 20647251.

It is an arithmetic number, because the mean of its divisors is an integer number (2498288331).

Almost surely, 2^9951859061 is an apocalyptic number.

It is an amenable number.

9951859061 is a deficient number, since it is larger than the sum of its proper divisors (41294263).

9951859061 is a wasteful number, since it uses less digits than its factorization.

9951859061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41294262.

The product of its (nonzero) digits is 874800, while the sum is 53.

The square root of 9951859061 is about 99759.0049118374. The cubic root of 9951859061 is about 2150.9719103911.

The spelling of 9951859061 in words is "nine billion, nine hundred fifty-one million, eight hundred fifty-nine thousand, sixty-one".