645031130 has 8 divisors (see below), whose sum is σ = 1161056052. Its totient is φ = 258012448.

The previous prime is 645031117. The next prime is 645031151. The reversal of 645031130 is 31130546.

It is a happy number.

645031130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 631466641 + 13564489 = 25129^2 + 3683^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 645031096 and 645031105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32251547 + ... + 32251566.

Almost surely, 2^645031130 is an apocalyptic number.

645031130 is a deficient number, since it is larger than the sum of its proper divisors (516024922).

645031130 is a wasteful number, since it uses less digits than its factorization.

645031130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64503120.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 645031130 is about 25397.4630622824. The cubic root of 645031130 is about 864.0261596518.

Adding to 645031130 its reverse (31130546), we get a palindrome (676161676).

The spelling of 645031130 in words is "six hundred forty-five million, thirty-one thousand, one hundred thirty".