645136147 has 4 divisors (see below), whose sum is σ = 658862496. Its totient is φ = 631409800.

The previous prime is 645136123. The next prime is 645136153. The reversal of 645136147 is 741631546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645136147 - 2¹⁹ = 644611859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645136157) 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, 6863104 + ... + 6863197.

It is an arithmetic number, because the mean of its divisors is an integer number (164715624).

Almost surely, 2^645136147 is an apocalyptic number.

645136147 is a deficient number, since it is larger than the sum of its proper divisors (13726349).

645136147 is a wasteful number, since it uses less digits than its factorization.

645136147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13726348.

The product of its digits is 60480, while the sum is 37.

The square root of 645136147 is about 25399.5304484158. The cubic root of 645136147 is about 864.0730475755.

The spelling of 645136147 in words is "six hundred forty-five million, one hundred thirty-six thousand, one hundred forty-seven".