642154591 has 8 divisors (see below), whose sum is σ = 694655360. Its totient is φ = 590097312.

The previous prime is 642154589. The next prime is 642154613. The reversal of 642154591 is 195451246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642154591 - 2¹ = 642154589 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 642154591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642154691) 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 7 ways as a sum of consecutive naturals, for example, 107856 + ... + 113653.

It is an arithmetic number, because the mean of its divisors is an integer number (86831920).

Almost surely, 2^642154591 is an apocalyptic number.

642154591 is the 14631-st hex number.

642154591 is a deficient number, since it is larger than the sum of its proper divisors (52500769).

642154591 is a wasteful number, since it uses less digits than its factorization.

642154591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221745.

The product of its digits is 43200, while the sum is 37.

The square root of 642154591 is about 25340.7693450692. The cubic root of 642154591 is about 862.7398606429.

The spelling of 642154591 in words is "six hundred forty-two million, one hundred fifty-four thousand, five hundred ninety-one".