1642246321 has 4 divisors (see below), whose sum is σ = 1642508272. Its totient is φ = 1641984372.

The previous prime is 1642246301. The next prime is 1642246337. The reversal of 1642246321 is 1236422461.

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.

It is a cyclic number.

It is not a de Polignac number, because 1642246321 - 2¹⁷ = 1642115249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642246301) 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, 121335 + ... + 134188.

It is an arithmetic number, because the mean of its divisors is an integer number (410627068).

Almost surely, 2^1642246321 is an apocalyptic number.

It is an amenable number.

1642246321 is a deficient number, since it is larger than the sum of its proper divisors (261951).

1642246321 is an equidigital number, since it uses as much as digits as its factorization.

1642246321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261950.

The product of its digits is 13824, while the sum is 31.

The square root of 1642246321 is about 40524.6384437912. The cubic root of 1642246321 is about 1179.8118825367.

Adding to 1642246321 its reverse (1236422461), we get a palindrome (2878668782).

The spelling of 1642246321 in words is "one billion, six hundred forty-two million, two hundred forty-six thousand, three hundred twenty-one".