645037411 has 2 divisors, whose sum is σ = 645037412. Its totient is φ = 645037410.

The previous prime is 645037387. The next prime is 645037427. The reversal of 645037411 is 114730546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645037411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645038411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322518705 + 322518706.

It is an arithmetic number, because the mean of its divisors is an integer number (322518706).

Almost surely, 2^645037411 is an apocalyptic number.

645037411 is a deficient number, since it is larger than the sum of its proper divisors (1).

645037411 is an equidigital number, since it uses as much as digits as its factorization.

645037411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 645037411 is about 25397.5867160642. The cubic root of 645037411 is about 864.0289641318.

Adding to 645037411 its reverse (114730546), we get a palindrome (759767957).

The spelling of 645037411 in words is "six hundred forty-five million, thirty-seven thousand, four hundred eleven".