1215104431 has 4 divisors (see below), whose sum is σ = 1215268912. Its totient is φ = 1214939952.

The previous prime is 1215104417. The next prime is 1215104459. The reversal of 1215104431 is 1344015121.

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

It is a cyclic number.

It is not a de Polignac number, because 1215104431 - 2²³ = 1206715823 is a prime.

It is a super-2 number, since 2×1215104431² = 2952957556471667522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215104731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70611 + ... + 86116.

It is an arithmetic number, because the mean of its divisors is an integer number (303817228).

Almost surely, 2^1215104431 is an apocalyptic number.

1215104431 is a deficient number, since it is larger than the sum of its proper divisors (164481).

1215104431 is an equidigital number, since it uses as much as digits as its factorization.

1215104431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164480.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1215104431 is about 34858.3480819158. The cubic root of 1215104431 is about 1067.0985624814.

Adding to 1215104431 its reverse (1344015121), we get a palindrome (2559119552).

The spelling of 1215104431 in words is "one billion, two hundred fifteen million, one hundred four thousand, four hundred thirty-one".