645954101 has 8 divisors (see below), whose sum is σ = 696084480. Its totient is φ = 595886832.

The previous prime is 645954061. The next prime is 645954107. The reversal of 645954101 is 101459546.

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 645954101 - 2¹⁸ = 645691957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645954107) 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, 6680 + ... + 36558.

It is an arithmetic number, because the mean of its divisors is an integer number (87010560).

Almost surely, 2^645954101 is an apocalyptic number.

It is an amenable number.

645954101 is a deficient number, since it is larger than the sum of its proper divisors (50130379).

645954101 is a wasteful number, since it uses less digits than its factorization.

645954101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31555.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 645954101 is about 25415.6271022377. The cubic root of 645954101 is about 864.4380731177.

The spelling of 645954101 in words is "six hundred forty-five million, nine hundred fifty-four thousand, one hundred one".