642611447 has 2 divisors, whose sum is σ = 642611448. Its totient is φ = 642611446.

The previous prime is 642611443. The next prime is 642611507. The reversal of 642611447 is 744116246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642611447 - 2² = 642611443 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642611443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321305723 + 321305724.

It is an arithmetic number, because the mean of its divisors is an integer number (321305724).

Almost surely, 2^642611447 is an apocalyptic number.

642611447 is a deficient number, since it is larger than the sum of its proper divisors (1).

642611447 is an equidigital number, since it uses as much as digits as its factorization.

642611447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 642611447 is about 25349.7819911730. The cubic root of 642611447 is about 862.9444087134.

The spelling of 642611447 in words is "six hundred forty-two million, six hundred eleven thousand, four hundred forty-seven".