645489151 has 4 divisors (see below), whose sum is σ = 645546400. Its totient is φ = 645431904.

The previous prime is 645489149. The next prime is 645489179. The reversal of 645489151 is 151984546.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 645489151 - 2¹ = 645489149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645489098 and 645489107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645489101) 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 3 ways as a sum of consecutive naturals, for example, 5466 + ... + 36343.

It is an arithmetic number, because the mean of its divisors is an integer number (161386600).

Almost surely, 2^645489151 is an apocalyptic number.

645489151 is a deficient number, since it is larger than the sum of its proper divisors (57249).

645489151 is a wasteful number, since it uses less digits than its factorization.

645489151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57248.

The product of its digits is 172800, while the sum is 43.

The square root of 645489151 is about 25406.4785241875. The cubic root of 645489151 is about 864.2306192896.

The spelling of 645489151 in words is "six hundred forty-five million, four hundred eighty-nine thousand, one hundred fifty-one".