209120878951 has 2 divisors, whose sum is σ = 209120878952. Its totient is φ = 209120878950.

The previous prime is 209120878909. The next prime is 209120878961. The reversal of 209120878951 is 159878021902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209120878951 - 2¹⁷ = 209120747879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209120878961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104560439475 + 104560439476.

It is an arithmetic number, because the mean of its divisors is an integer number (104560439476).

Almost surely, 2^209120878951 is an apocalyptic number.

209120878951 is a deficient number, since it is larger than the sum of its proper divisors (1).

209120878951 is an equidigital number, since it uses as much as digits as its factorization.

209120878951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 209120878951 in words is "two hundred nine billion, one hundred twenty million, eight hundred seventy-eight thousand, nine hundred fifty-one".