645606129 has 8 divisors (see below), whose sum is σ = 983780800. Its totient is φ = 368917776.

The previous prime is 645606119. The next prime is 645606139. The reversal of 645606129 is 921606546.

It is an interprime number because it is at equal distance from previous prime (645606119) and next prime (645606139).

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

It is not a de Polignac number, because 645606129 - 2⁵ = 645606097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645606119) 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 7 ways as a sum of consecutive naturals, for example, 15371554 + ... + 15371595.

It is an arithmetic number, because the mean of its divisors is an integer number (122972600).

Almost surely, 2^645606129 is an apocalyptic number.

It is an amenable number.

645606129 is a deficient number, since it is larger than the sum of its proper divisors (338174671).

645606129 is a wasteful number, since it uses less digits than its factorization.

645606129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30743159.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 645606129 is about 25408.7805492511. The cubic root of 645606129 is about 864.2828225233.

The spelling of 645606129 in words is "six hundred forty-five million, six hundred six thousand, one hundred twenty-nine".