1215115141 has 4 divisors (see below), whose sum is σ = 1218997612. Its totient is φ = 1211232672.

The previous prime is 1215115133. The next prime is 1215115157. The reversal of 1215115141 is 1415115121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1415115121 = 7 ⋅202159303.

It can be written as a sum of positive squares in 2 ways, for example, as 64480900 + 1150634241 = 8030^2 + 33921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215115141 - 2³ = 1215115133 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 (1215112141) 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, 1940766 + ... + 1941391.

It is an arithmetic number, because the mean of its divisors is an integer number (304749403).

Almost surely, 2^1215115141 is an apocalyptic number.

It is an amenable number.

1215115141 is a deficient number, since it is larger than the sum of its proper divisors (3882471).

1215115141 is an equidigital number, since it uses as much as digits as its factorization.

1215115141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882470.

The product of its digits is 200, while the sum is 22.

The square root of 1215115141 is about 34858.5017033148. The cubic root of 1215115141 is about 1067.1016976281.

The spelling of 1215115141 in words is "one billion, two hundred fifteen million, one hundred fifteen thousand, one hundred forty-one".