9971251623 has 24 divisors (see below), whose sum is σ = 15171589680. Its totient is φ = 6293220480.

The previous prime is 9971251579. The next prime is 9971251637. The reversal of 9971251623 is 3261521799.

It is a happy number.

9971251623 is a `hidden beast` number, since 9 + 9 + 7 + 12 + 5 + 1 + 623 = 666.

9971251623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9971251623 - 2⁶ = 9971251559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971253623) 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 23 ways as a sum of consecutive naturals, for example, 233565 + ... + 272937.

It is an arithmetic number, because the mean of its divisors is an integer number (632149570).

Almost surely, 2^9971251623 is an apocalyptic number.

9971251623 is a deficient number, since it is larger than the sum of its proper divisors (5200338057).

9971251623 is a wasteful number, since it uses less digits than its factorization.

9971251623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40879 (or 40876 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 9971251623 is about 99856.1546575873. The cubic root of 9971251623 is about 2152.3681584276.

The spelling of 9971251623 in words is "nine billion, nine hundred seventy-one million, two hundred fifty-one thousand, six hundred twenty-three".