1640232517 has 32 divisors (see below), whose sum is σ = 2101248000. Its totient is φ = 1269198000.

The previous prime is 1640232493. The next prime is 1640232521. The reversal of 1640232517 is 7152320461.

It is not a de Polignac number, because 1640232517 - 2¹⁹ = 1639708229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640232527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 568284 + ... + 571162.

It is an arithmetic number, because the mean of its divisors is an integer number (65664000).

Almost surely, 2^1640232517 is an apocalyptic number.

It is an amenable number.

1640232517 is a deficient number, since it is larger than the sum of its proper divisors (461015483).

1640232517 is a wasteful number, since it uses less digits than its factorization.

1640232517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 3048 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1640232517 is about 40499.7841599187. The cubic root of 1640232517 is about 1179.3294373085.

Adding to 1640232517 its reverse (7152320461), we get a palindrome (8792552978).

The spelling of 1640232517 in words is "one billion, six hundred forty million, two hundred thirty-two thousand, five hundred seventeen".