9999997542 has 24 divisors (see below), whose sum is σ = 21791908944. Its totient is φ = 3314063664.

The previous prime is 9999997537. The next prime is 9999997543. The reversal of 9999997542 is 2457999999.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999997543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1602538 + ... + 1608765.

It is an arithmetic number, because the mean of its divisors is an integer number (907996206).

Almost surely, 2^9999997542 is an apocalyptic number.

9999997542 is an abundant number, since it is smaller than the sum of its proper divisors (11791911402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999997542 is a wasteful number, since it uses less digits than its factorization.

9999997542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211484 (or 3211481 counting only the distinct ones).

The product of its digits is 148803480, while the sum is 72.

The square root of 9999997542 is about 99999.9877099992. The cubic root of 9999997542 is about 2154.4345135119.

The spelling of 9999997542 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, five hundred forty-two".