642196253 has 2 divisors, whose sum is σ = 642196254. Its totient is φ = 642196252.

The previous prime is 642196249. The next prime is 642196319. The reversal of 642196253 is 352691246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587480644 + 54715609 = 24238^2 + 7397^2 .

It is a cyclic number.

It is not a de Polignac number, because 642196253 - 2² = 642196249 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 (642196153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321098126 + 321098127.

It is an arithmetic number, because the mean of its divisors is an integer number (321098127).

Almost surely, 2^642196253 is an apocalyptic number.

It is an amenable number.

642196253 is a deficient number, since it is larger than the sum of its proper divisors (1).

642196253 is an equidigital number, since it uses as much as digits as its factorization.

642196253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 642196253 is about 25341.5913667631. The cubic root of 642196253 is about 862.7585179835.

The spelling of 642196253 in words is "six hundred forty-two million, one hundred ninety-six thousand, two hundred fifty-three".