645031102 has 16 divisors (see below), whose sum is σ = 1046260800. Its totient is φ = 297084928.

The previous prime is 645031099. The next prime is 645031117. The reversal of 645031102 is 201130546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200227 + ... + 203422.

It is an arithmetic number, because the mean of its divisors is an integer number (65391300).

Almost surely, 2^645031102 is an apocalyptic number.

645031102 is a deficient number, since it is larger than the sum of its proper divisors (401229698).

645031102 is a wasteful number, since it uses less digits than its factorization.

645031102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403715.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 645031102 is about 25397.4625110463. The cubic root of 645031102 is about 864.0261471497.

Adding to 645031102 its reverse (201130546), we get a palindrome (846161648).

The spelling of 645031102 in words is "six hundred forty-five million, thirty-one thousand, one hundred two".