1215115355 has 4 divisors (see below), whose sum is σ = 1458138432. Its totient is φ = 972092280.

The previous prime is 1215115351. The next prime is 1215115387. The reversal of 1215115355 is 5535115121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5535115121 = 769 ⋅7197809.

It is not a de Polignac number, because 1215115355 - 2² = 1215115351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215115351) 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, 121511531 + ... + 121511540.

It is an arithmetic number, because the mean of its divisors is an integer number (364534608).

Almost surely, 2^1215115355 is an apocalyptic number.

1215115355 is a deficient number, since it is larger than the sum of its proper divisors (243023077).

1215115355 is an equidigital number, since it uses as much as digits as its factorization.

1215115355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243023076.

The product of its digits is 3750, while the sum is 29.

The square root of 1215115355 is about 34858.5047728671. The cubic root of 1215115355 is about 1067.1017602723.

The spelling of 1215115355 in words is "one billion, two hundred fifteen million, one hundred fifteen thousand, three hundred fifty-five".