83661513 has 16 divisors (see below), whose sum is σ = 121484160. Its totient is φ = 50903424.

The previous prime is 83661509. The next prime is 83661521. The reversal of 83661513 is 31516638.

It is not a de Polignac number, because 83661513 - 2² = 83661509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83661583) 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, 8581 + ... + 15522.

It is an arithmetic number, because the mean of its divisors is an integer number (7592760).

Almost surely, 2^83661513 is an apocalyptic number.

It is an amenable number.

83661513 is a deficient number, since it is larger than the sum of its proper divisors (37822647).

83661513 is a wasteful number, since it uses less digits than its factorization.

83661513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24208.

The product of its digits is 12960, while the sum is 33.

The square root of 83661513 is about 9146.6667699223. Note that the first 3 decimals coincide. The cubic root of 83661513 is about 437.3628640119.

The spelling of 83661513 in words is "eighty-three million, six hundred sixty-one thousand, five hundred thirteen".