7845542309 has 4 divisors (see below), whose sum is σ = 8558773440. Its totient is φ = 7132311180.

The previous prime is 7845542303. The next prime is 7845542311. The reversal of 7845542309 is 9032455487.

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 7845542309 - 2⁴ = 7845542293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7845542303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356615549 + ... + 356615570.

It is an arithmetic number, because the mean of its divisors is an integer number (2139693360).

Almost surely, 2^7845542309 is an apocalyptic number.

It is an amenable number.

7845542309 is a deficient number, since it is larger than the sum of its proper divisors (713231131).

7845542309 is a wasteful number, since it uses less digits than its factorization.

7845542309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713231130.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The square root of 7845542309 is about 88575.0659553805. The cubic root of 7845542309 is about 1987.0447881910.

The spelling of 7845542309 in words is "seven billion, eight hundred forty-five million, five hundred forty-two thousand, three hundred nine".