100642879 has 2 divisors, whose sum is σ = 100642880. Its totient is φ = 100642878.

The previous prime is 100642877. The next prime is 100642897. The reversal of 100642879 is 978246001.

Together with next prime (100642897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100642879 - 2¹ = 100642877 is a prime.

Together with 100642877, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100642877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50321439 + 50321440.

It is an arithmetic number, because the mean of its divisors is an integer number (50321440).

Almost surely, 2^100642879 is an apocalyptic number.

100642879 is a deficient number, since it is larger than the sum of its proper divisors (1).

100642879 is an equidigital number, since it uses as much as digits as its factorization.

100642879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 100642879 is about 10032.0924537207. The cubic root of 100642879 is about 465.1514194507.

The spelling of 100642879 in words is "one hundred million, six hundred forty-two thousand, eight hundred seventy-nine".