645061451 has 2 divisors, whose sum is σ = 645061452. Its totient is φ = 645061450.

The previous prime is 645061433. The next prime is 645061453. The reversal of 645061451 is 154160546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645061451 is a prime.

It is a super-2 number, since 2×645061451² = 832208551132450802, which contains 22 as substring.

Together with 645061453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645061453) 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, 322530725 + 322530726.

It is an arithmetic number, because the mean of its divisors is an integer number (322530726).

Almost surely, 2^645061451 is an apocalyptic number.

645061451 is a deficient number, since it is larger than the sum of its proper divisors (1).

645061451 is an equidigital number, since it uses as much as digits as its factorization.

645061451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 645061451 is about 25398.0599849674. The cubic root of 645061451 is about 864.0396978752.

The spelling of 645061451 in words is "six hundred forty-five million, sixty-one thousand, four hundred fifty-one".