1642154401 has 4 divisors (see below), whose sum is σ = 1728583600. Its totient is φ = 1555725204.

The previous prime is 1642154399. The next prime is 1642154417. The reversal of 1642154401 is 1044512461.

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: 1044512461 = 367 ⋅2846083.

It is a cyclic number.

It is not a de Polignac number, because 1642154401 - 2¹ = 1642154399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642154401.

It is not an unprimeable number, because it can be changed into a prime (1642154431) 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, 43214571 + ... + 43214608.

It is an arithmetic number, because the mean of its divisors is an integer number (432145900).

Almost surely, 2^1642154401 is an apocalyptic number.

It is an amenable number.

1642154401 is a deficient number, since it is larger than the sum of its proper divisors (86429199).

1642154401 is an equidigital number, since it uses as much as digits as its factorization.

1642154401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86429198.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1642154401 is about 40523.5043030585. The cubic root of 1642154401 is about 1179.7898699372.

Adding to 1642154401 its reverse (1044512461), we get a palindrome (2686666862).

The spelling of 1642154401 in words is "one billion, six hundred forty-two million, one hundred fifty-four thousand, four hundred one".