4242639545 has 4 divisors (see below), whose sum is σ = 5091167460. Its totient is φ = 3394111632.

The previous prime is 4242639539. The next prime is 4242639587. The reversal of 4242639545 is 5459362424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1655187856 + 2587451689 = 40684^2 + 50867^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242639545 - 2⁴ = 4242639529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4242639496 and 4242639505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424263950 + ... + 424263959.

It is an arithmetic number, because the mean of its divisors is an integer number (1272791865).

Almost surely, 2^4242639545 is an apocalyptic number.

It is an amenable number.

4242639545 is a deficient number, since it is larger than the sum of its proper divisors (848527915).

4242639545 is an equidigital number, since it uses as much as digits as its factorization.

4242639545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848527914.

The product of its digits is 1036800, while the sum is 44.

The square root of 4242639545 is about 65135.5474760134. The cubic root of 4242639545 is about 1618.8702615939.

The spelling of 4242639545 in words is "four billion, two hundred forty-two million, six hundred thirty-nine thousand, five hundred forty-five".