1215113461 has 4 divisors (see below), whose sum is σ = 1215324000. Its totient is φ = 1214902924.

The previous prime is 1215113453. The next prime is 1215113467. The reversal of 1215113461 is 1643115121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1643115121 = 1039 ⋅1581439.

It is a cyclic number.

It is not a de Polignac number, because 1215113461 - 2³ = 1215113453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215113467) 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, 96361 + ... + 108238.

It is an arithmetic number, because the mean of its divisors is an integer number (303831000).

Almost surely, 2^1215113461 is an apocalyptic number.

It is an amenable number.

1215113461 is a deficient number, since it is larger than the sum of its proper divisors (210539).

1215113461 is an equidigital number, since it uses as much as digits as its factorization.

1215113461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210538.

The product of its digits is 720, while the sum is 25.

The square root of 1215113461 is about 34858.4776058852. The cubic root of 1215113461 is about 1067.1012058416.

Adding to 1215113461 its reverse (1643115121), we get a palindrome (2858228582).

The spelling of 1215113461 in words is "one billion, two hundred fifteen million, one hundred thirteen thousand, four hundred sixty-one".