645251122 has 8 divisors (see below), whose sum is σ = 977273856. Its totient is φ = 319493172.

The previous prime is 645251083. The next prime is 645251141. The reversal of 645251122 is 221152546.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1565938 + ... + 1566349.

It is an arithmetic number, because the mean of its divisors is an integer number (122159232).

Almost surely, 2^645251122 is an apocalyptic number.

645251122 is a deficient number, since it is larger than the sum of its proper divisors (332022734).

645251122 is a wasteful number, since it uses less digits than its factorization.

645251122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132392.

The product of its digits is 4800, while the sum is 28.

The square root of 645251122 is about 25401.7936768253. The cubic root of 645251122 is about 864.1243757062.

The spelling of 645251122 in words is "six hundred forty-five million, two hundred fifty-one thousand, one hundred twenty-two".