642436451 has 2 divisors, whose sum is σ = 642436452. Its totient is φ = 642436450.

The previous prime is 642436447. The next prime is 642436499. The reversal of 642436451 is 154634246.

642436451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642436451 - 2² = 642436447 is a prime.

It is not a weakly prime, because it can be changed into another prime (642436411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321218225 + 321218226.

It is an arithmetic number, because the mean of its divisors is an integer number (321218226).

Almost surely, 2^642436451 is an apocalyptic number.

642436451 is a deficient number, since it is larger than the sum of its proper divisors (1).

642436451 is an equidigital number, since it uses as much as digits as its factorization.

642436451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 35.

The square root of 642436451 is about 25346.3301288372. The cubic root of 642436451 is about 862.8660692386.

It can be divided in two parts, 6424 and 36451, that added together give a cube (42875 = 35³).

The spelling of 642436451 in words is "six hundred forty-two million, four hundred thirty-six thousand, four hundred fifty-one".