642346249 has 2 divisors, whose sum is σ = 642346250. Its totient is φ = 642346248.

The previous prime is 642346183. The next prime is 642346253. The reversal of 642346249 is 942643246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626000400 + 16345849 = 25020^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 642346249 - 2¹⁵ = 642313481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642346349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321173124 + 321173125.

It is an arithmetic number, because the mean of its divisors is an integer number (321173125).

Almost surely, 2^642346249 is an apocalyptic number.

It is an amenable number.

642346249 is a deficient number, since it is larger than the sum of its proper divisors (1).

642346249 is an equidigital number, since it uses as much as digits as its factorization.

642346249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 40.

The square root of 642346249 is about 25344.5506766247. The cubic root of 642346249 is about 862.8256834604.

The spelling of 642346249 in words is "six hundred forty-two million, three hundred forty-six thousand, two hundred forty-nine".