1642724117 has 4 divisors (see below), whose sum is σ = 1642873440. Its totient is φ = 1642574796.

The previous prime is 1642724099. The next prime is 1642724129. The reversal of 1642724117 is 7114272461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7114272461 = 7103 ⋅1001587.

It is a cyclic number.

It is not a de Polignac number, because 1642724117 - 2¹² = 1642720021 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 (1642724137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56723 + ... + 80640.

It is an arithmetic number, because the mean of its divisors is an integer number (410718360).

Almost surely, 2^1642724117 is an apocalyptic number.

It is an amenable number.

1642724117 is a deficient number, since it is larger than the sum of its proper divisors (149323).

1642724117 is a wasteful number, since it uses less digits than its factorization.

1642724117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149322.

The product of its digits is 18816, while the sum is 35.

The square root of 1642724117 is about 40530.5331447786. The cubic root of 1642724117 is about 1179.9262898034.

Adding to 1642724117 its reverse (7114272461), we get a palindrome (8756996578).

The spelling of 1642724117 in words is "one billion, six hundred forty-two million, seven hundred twenty-four thousand, one hundred seventeen".