645024031 has 2 divisors, whose sum is σ = 645024032. Its totient is φ = 645024030.

The previous prime is 645024011. The next prime is 645024043. The reversal of 645024031 is 130420546.

645024031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645024031 - 2⁷ = 645023903 is a prime.

It is a super-2 number, since 2×645024031² = 832112001134977922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645023987 and 645024005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645024011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322512015 + 322512016.

It is an arithmetic number, because the mean of its divisors is an integer number (322512016).

Almost surely, 2^645024031 is an apocalyptic number.

645024031 is a deficient number, since it is larger than the sum of its proper divisors (1).

645024031 is an equidigital number, since it uses as much as digits as its factorization.

645024031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 645024031 is about 25397.3233038444. The cubic root of 645024031 is about 864.0229899111.

Adding to 645024031 its reverse (130420546), we get a palindrome (775444577).

The spelling of 645024031 in words is "six hundred forty-five million, twenty-four thousand, thirty-one".