645004001231 has 2 divisors, whose sum is σ = 645004001232. Its totient is φ = 645004001230.

The previous prime is 645004001203. The next prime is 645004001249. The reversal of 645004001231 is 132100400546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645004001231 is a prime.

It is a super-2 number, since 2×645004001231² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645004001231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645004001261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322502000615 + 322502000616.

It is an arithmetic number, because the mean of its divisors is an integer number (322502000616).

Almost surely, 2^645004001231 is an apocalyptic number.

645004001231 is a deficient number, since it is larger than the sum of its proper divisors (1).

645004001231 is an equidigital number, since it uses as much as digits as its factorization.

645004001231 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 26.

Adding to 645004001231 its reverse (132100400546), we get a palindrome (777104401777).

The spelling of 645004001231 in words is "six hundred forty-five billion, four million, one thousand, two hundred thirty-one".