642376751 has 2 divisors, whose sum is σ = 642376752. Its totient is φ = 642376750.

The previous prime is 642376733. The next prime is 642376753. The reversal of 642376751 is 157673246.

642376751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642376751 is a prime.

Together with 642376753, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 642376699 and 642376708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642376753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321188375 + 321188376.

It is an arithmetic number, because the mean of its divisors is an integer number (321188376).

Almost surely, 2^642376751 is an apocalyptic number.

642376751 is a deficient number, since it is larger than the sum of its proper divisors (1).

642376751 is an equidigital number, since it uses as much as digits as its factorization.

642376751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 41.

The square root of 642376751 is about 25345.1524161919. The cubic root of 642376751 is about 862.8393404211.

The spelling of 642376751 in words is "six hundred forty-two million, three hundred seventy-six thousand, seven hundred fifty-one".