102315242 has 4 divisors (see below), whose sum is σ = 153472866. Its totient is φ = 51157620.

The previous prime is 102315229. The next prime is 102315251. The reversal of 102315242 is 242513201.

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., 100380361 + 1934881 = 10019^2 + 1391^2 .

It is a super-3 number, since 3×102315242³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25578809 + ... + 25578812.

Almost surely, 2^102315242 is an apocalyptic number.

102315242 is a deficient number, since it is larger than the sum of its proper divisors (51157624).

102315242 is an equidigital number, since it uses as much as digits as its factorization.

102315242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51157623.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 102315242 is about 10115.0997029194. The cubic root of 102315242 is about 467.7137223299.

Adding to 102315242 its reverse (242513201), we get a palindrome (344828443).

The spelling of 102315242 in words is "one hundred two million, three hundred fifteen thousand, two hundred forty-two".