1215431242 has 4 divisors (see below), whose sum is σ = 1823146866. Its totient is φ = 607715620.

The previous prime is 1215431221. The next prime is 1215431281. The reversal of 1215431242 is 2421345121.

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., 717650521 + 497780721 = 26789^2 + 22311^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303857809 + ... + 303857812.

Almost surely, 2^1215431242 is an apocalyptic number.

1215431242 is a deficient number, since it is larger than the sum of its proper divisors (607715624).

1215431242 is an equidigital number, since it uses as much as digits as its factorization.

1215431242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607715623.

The product of its digits is 1920, while the sum is 25.

The square root of 1215431242 is about 34863.0354673829. The cubic root of 1215431242 is about 1067.1942218280.

Adding to 1215431242 its reverse (2421345121), we get a palindrome (3636776363).

The spelling of 1215431242 in words is "one billion, two hundred fifteen million, four hundred thirty-one thousand, two hundred forty-two".