642981197 has 8 divisors (see below), whose sum is σ = 658560000. Its totient is φ = 627481584.

The previous prime is 642981179. The next prime is 642981203. The reversal of 642981197 is 791189246.

642981197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 642981197 - 2⁸ = 642980941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642981167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3197 + ... + 36002.

It is an arithmetic number, because the mean of its divisors is an integer number (82320000).

Almost surely, 2^642981197 is an apocalyptic number.

It is an amenable number.

642981197 is a deficient number, since it is larger than the sum of its proper divisors (15578803).

642981197 is a wasteful number, since it uses less digits than its factorization.

642981197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39595.

The product of its digits is 217728, while the sum is 47.

The square root of 642981197 is about 25357.0739045340. The cubic root of 642981197 is about 863.1098858558.

The spelling of 642981197 in words is "six hundred forty-two million, nine hundred eighty-one thousand, one hundred ninety-seven".