1215112145 has 16 divisors (see below), whose sum is σ = 1662670800. Its totient is φ = 844529664.

The previous prime is 1215112141. The next prime is 1215112147. The reversal of 1215112145 is 5412115121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 288762049 + 926350096 = 16993^2 + 30436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215112145 - 2² = 1215112141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215112145.

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 15 ways as a sum of consecutive naturals, for example, 548720 + ... + 550929.

It is an arithmetic number, because the mean of its divisors is an integer number (103916925).

Almost surely, 2^1215112145 is an apocalyptic number.

It is an amenable number.

1215112145 is a deficient number, since it is larger than the sum of its proper divisors (447558655).

1215112145 is a wasteful number, since it uses less digits than its factorization.

1215112145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099684.

The product of its digits is 400, while the sum is 23.

The square root of 1215112145 is about 34858.4587295537. The cubic root of 1215112145 is about 1067.1008206086.

Adding to 1215112145 its reverse (5412115121), we get a palindrome (6627227266).

The spelling of 1215112145 in words is "one billion, two hundred fifteen million, one hundred twelve thousand, one hundred forty-five".