1642121 has 4 divisors (see below), whose sum is σ = 1768452. Its totient is φ = 1515792.

The previous prime is 1642117. The next prime is 1642141. The reversal of 1642121 is 1212461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212461 = 29 ⋅41809.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 1452025 = 436^2 + 1205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642121 - 2² = 1642117 is a prime.

It is a super-2 number, since 2×1642121² = 5393122757282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642141) 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, 63146 + ... + 63171.

It is an arithmetic number, because the mean of its divisors is an integer number (442113).

2^1642121 is an apocalyptic number.

It is an amenable number.

1642121 is a deficient number, since it is larger than the sum of its proper divisors (126331).

1642121 is a wasteful number, since it uses less digits than its factorization.

1642121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126330.

The product of its digits is 96, while the sum is 17.

The square root of 1642121 is about 1281.4526912844. The cubic root of 1642121 is about 117.9781871008.

Adding to 1642121 its reverse (1212461), we get a palindrome (2854582).

The spelling of 1642121 in words is "one million, six hundred forty-two thousand, one hundred twenty-one".