642954223 has 2 divisors, whose sum is σ = 642954224. Its totient is φ = 642954222.

The previous prime is 642954199. The next prime is 642954239. The reversal of 642954223 is 322459246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642954223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642954283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321477111 + 321477112.

It is an arithmetic number, because the mean of its divisors is an integer number (321477112).

Almost surely, 2^642954223 is an apocalyptic number.

642954223 is a deficient number, since it is larger than the sum of its proper divisors (1).

642954223 is an equidigital number, since it uses as much as digits as its factorization.

642954223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 642954223 is about 25356.5420158191. The cubic root of 642954223 is about 863.0978161137.

The spelling of 642954223 in words is "six hundred forty-two million, nine hundred fifty-four thousand, two hundred twenty-three".