615243242 has 4 divisors (see below), whose sum is σ = 922864866. Its totient is φ = 307621620.

The previous prime is 615243191. The next prime is 615243247. The reversal of 615243242 is 242342516.

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

It can be written as a sum of positive squares in only one way, i.e., 605701321 + 9541921 = 24611^2 + 3089^2 .

It is not an unprimeable number, because it can be changed into a prime (615243247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153810809 + ... + 153810812.

Almost surely, 2^615243242 is an apocalyptic number.

615243242 is a deficient number, since it is larger than the sum of its proper divisors (307621624).

615243242 is a wasteful number, since it uses less digits than its factorization.

615243242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307621623.

The product of its digits is 11520, while the sum is 29.

The square root of 615243242 is about 24804.0972825056. The cubic root of 615243242 is about 850.5156004435.

Adding to 615243242 its reverse (242342516), we get a palindrome (857585758).

It can be divided in two parts, 6152 and 43242, that added together give a palindrome (49394).

The spelling of 615243242 in words is "six hundred fifteen million, two hundred forty-three thousand, two hundred forty-two".