645354201 has 4 divisors (see below), whose sum is σ = 860472272. Its totient is φ = 430236132.

The previous prime is 645354181. The next prime is 645354211. The reversal of 645354201 is 102453546.

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.

It is not a de Polignac number, because 645354201 - 2⁵ = 645354169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645354211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107559031 + ... + 107559036.

It is an arithmetic number, because the mean of its divisors is an integer number (215118068).

Almost surely, 2^645354201 is an apocalyptic number.

It is an amenable number.

645354201 is a deficient number, since it is larger than the sum of its proper divisors (215118071).

645354201 is a wasteful number, since it uses less digits than its factorization.

645354201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215118070.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 645354201 is about 25403.8225666926. The cubic root of 645354201 is about 864.1703879387.

The spelling of 645354201 in words is "six hundred forty-five million, three hundred fifty-four thousand, two hundred one".