1215532442 has 4 divisors (see below), whose sum is σ = 1823298666. Its totient is φ = 607766220.

The previous prime is 1215532441. The next prime is 1215532447. The reversal of 1215532442 is 2442355121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2442355121 = 1381 ⋅1768541.

It can be written as a sum of positive squares in only one way, i.e., 1027266601 + 188265841 = 32051^2 + 13721^2 .

It is not an unprimeable number, because it can be changed into a prime (1215532441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303883109 + ... + 303883112.

Almost surely, 2^1215532442 is an apocalyptic number.

1215532442 is a deficient number, since it is larger than the sum of its proper divisors (607766224).

1215532442 is an equidigital number, since it uses as much as digits as its factorization.

1215532442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607766223.

The product of its digits is 9600, while the sum is 29.

The square root of 1215532442 is about 34864.4868311581. The cubic root of 1215532442 is about 1067.2238401380.

Adding to 1215532442 its reverse (2442355121), we get a palindrome (3657887563).

The spelling of 1215532442 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, four hundred forty-two".