9901602538 has 4 divisors (see below), whose sum is σ = 14852403810. Its totient is φ = 4950801268.

The previous prime is 9901602509. The next prime is 9901602551. The reversal of 9901602538 is 8352061099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8352061099 = 12401 ⋅673499.

It can be written as a sum of positive squares in only one way, i.e., 9014932809 + 886669729 = 94947^2 + 29777^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9901602494 and 9901602503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475400633 + ... + 2475400636.

Almost surely, 2^9901602538 is an apocalyptic number.

9901602538 is a deficient number, since it is larger than the sum of its proper divisors (4950801272).

9901602538 is a wasteful number, since it uses less digits than its factorization.

9901602538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950801271.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 9901602538 is about 99506.7964412482. The cubic root of 9901602538 is about 2147.3450219040.

The spelling of 9901602538 in words is "nine billion, nine hundred one million, six hundred two thousand, five hundred thirty-eight".