1642211729 has 4 divisors (see below), whose sum is σ = 1642376484. Its totient is φ = 1642046976.

The previous prime is 1642211687. The next prime is 1642211749. The reversal of 1642211729 is 9271122461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9271122461 = 21001 ⋅441461.

It can be written as a sum of positive squares in 2 ways, for example, as 32035600 + 1610176129 = 5660^2 + 40127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642211729 - 2²⁴ = 1625434513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642211749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66392 + ... + 87705.

It is an arithmetic number, because the mean of its divisors is an integer number (410594121).

Almost surely, 2^1642211729 is an apocalyptic number.

It is an amenable number.

1642211729 is a deficient number, since it is larger than the sum of its proper divisors (164755).

1642211729 is a wasteful number, since it uses less digits than its factorization.

1642211729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164754.

The product of its digits is 12096, while the sum is 35.

The square root of 1642211729 is about 40524.2116394631. The cubic root of 1642211729 is about 1179.8035986923.

The spelling of 1642211729 in words is "one billion, six hundred forty-two million, two hundred eleven thousand, seven hundred twenty-nine".