9742258731521 has 4 divisors (see below), whose sum is σ = 9968822888112. Its totient is φ = 9515694574932.

The previous prime is 9742258731487. The next prime is 9742258731533. The reversal of 9742258731521 is 1251378522479.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9742258731521 - 2¹⁰ = 9742258730497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9742258731551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113282078231 + ... + 113282078316.

It is an arithmetic number, because the mean of its divisors is an integer number (2492205722028).

Almost surely, 2^{9742258731521} is an apocalyptic number.

It is an amenable number.

9742258731521 is a deficient number, since it is larger than the sum of its proper divisors (226564156591).

9742258731521 is a wasteful number, since it uses less digits than its factorization.

9742258731521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226564156590.

The product of its digits is 8467200, while the sum is 56.

The spelling of 9742258731521 in words is "nine trillion, seven hundred forty-two billion, two hundred fifty-eight million, seven hundred thirty-one thousand, five hundred twenty-one".