641642451 has 8 divisors (see below), whose sum is σ = 868292544. Its totient is φ = 421377000.

The previous prime is 641642447. The next prime is 641642461. The reversal of 641642451 is 154246146.

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

It is not a de Polignac number, because 641642451 - 2² = 641642447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641642411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595925 + ... + 1596326.

It is an arithmetic number, because the mean of its divisors is an integer number (108536568).

Almost surely, 2^641642451 is an apocalyptic number.

641642451 is a deficient number, since it is larger than the sum of its proper divisors (226650093).

641642451 is a wasteful number, since it uses less digits than its factorization.

641642451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192321.

The product of its digits is 23040, while the sum is 33.

The square root of 641642451 is about 25330.6622692736. The cubic root of 641642451 is about 862.5104449061.

Adding to 641642451 its reverse (154246146), we get a palindrome (795888597).

The spelling of 641642451 in words is "six hundred forty-one million, six hundred forty-two thousand, four hundred fifty-one".