2139247515 has 16 divisors (see below), whose sum is σ = 3430199808. Its totient is φ = 1138464096.

The previous prime is 2139247511. The next prime is 2139247573. The reversal of 2139247515 is 5157429312.

It is not a de Polignac number, because 2139247515 - 2² = 2139247511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139247511) 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, 147069 + ... + 160958.

It is an arithmetic number, because the mean of its divisors is an integer number (214387488).

Almost surely, 2^2139247515 is an apocalyptic number.

2139247515 is a deficient number, since it is larger than the sum of its proper divisors (1290952293).

2139247515 is a wasteful number, since it uses less digits than its factorization.

2139247515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308498.

The product of its digits is 75600, while the sum is 39.

The square root of 2139247515 is about 46252.0001189138. Note that the first 3 decimals coincide. The cubic root of 2139247515 is about 1288.5076817861.

The spelling of 2139247515 in words is "two billion, one hundred thirty-nine million, two hundred forty-seven thousand, five hundred fifteen".