9961138054 has 32 divisors (see below), whose sum is σ = 17646538752. Its totient is φ = 4126788000.

The previous prime is 9961138027. The next prime is 9961138063. The reversal of 9961138054 is 4508311699.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 9961137995 and 9961138013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396199 + ... + 420589.

It is an arithmetic number, because the mean of its divisors is an integer number (551454336).

Almost surely, 2^9961138054 is an apocalyptic number.

9961138054 is a deficient number, since it is larger than the sum of its proper divisors (7685400698).

9961138054 is a wasteful number, since it uses less digits than its factorization.

9961138054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25372.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 9961138054 is about 99805.5011209302. The cubic root of 9961138054 is about 2151.6402161236.

The spelling of 9961138054 in words is "nine billion, nine hundred sixty-one million, one hundred thirty-eight thousand, fifty-four".