1215245139 has 16 divisors (see below), whose sum is σ = 1633632000. Its totient is φ = 803532960.

The previous prime is 1215245123. The next prime is 1215245147. The reversal of 1215245139 is 9315425121.

It is a happy number.

1215245139 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1215245139 - 2⁴ = 1215245123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215245189) 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, 247569 + ... + 252429.

It is an arithmetic number, because the mean of its divisors is an integer number (102102000).

Almost surely, 2^1215245139 is an apocalyptic number.

1215245139 is a deficient number, since it is larger than the sum of its proper divisors (418386861).

1215245139 is a wasteful number, since it uses less digits than its factorization.

1215245139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its digits is 10800, while the sum is 33.

The square root of 1215245139 is about 34860.3663061649. The cubic root of 1215245139 is about 1067.1397505761.

It can be divided in two parts, 12152 and 45139, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 1215245139 in words is "one billion, two hundred fifteen million, two hundred forty-five thousand, one hundred thirty-nine".