2131515 has 40 divisors (see below), whose sum is σ = 4036560. Its totient is φ = 1073088.

The previous prime is 2131513. The next prime is 2131517. The reversal of 2131515 is 5151312.

It is an interprime number because it is at equal distance from previous prime (2131513) and next prime (2131517).

It is not a de Polignac number, because 2131515 - 2¹ = 2131513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131513) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7557 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (100914).

2^2131515 is an apocalyptic number.

2131515 is a deficient number, since it is larger than the sum of its proper divisors (1905045).

2131515 is a wasteful number, since it uses less digits than its factorization.

2131515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 304 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 2131515 is about 1459.9708901208. The cubic root of 2131515 is about 128.6953329359.

Adding to 2131515 its reverse (5151312), we get a palindrome (7282827).

It can be divided in two parts, 213 and 1515, that added together give a cube (1728 = 12³).

The spelling of 2131515 in words is "two million, one hundred thirty-one thousand, five hundred fifteen".