642260429 has 2 divisors, whose sum is σ = 642260430. Its totient is φ = 642260428.

The previous prime is 642260389. The next prime is 642260461. The reversal of 642260429 is 924062246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468073225 + 174187204 = 21635^2 + 13198^2 .

It is a cyclic number.

It is not a de Polignac number, because 642260429 - 2¹⁶ = 642194893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642263429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321130214 + 321130215.

It is an arithmetic number, because the mean of its divisors is an integer number (321130215).

Almost surely, 2^642260429 is an apocalyptic number.

It is an amenable number.

642260429 is a deficient number, since it is larger than the sum of its proper divisors (1).

642260429 is an equidigital number, since it uses as much as digits as its factorization.

642260429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 642260429 is about 25342.8575539539. The cubic root of 642260429 is about 862.7872561074.

The spelling of 642260429 in words is "six hundred forty-two million, two hundred sixty thousand, four hundred twenty-nine".