212265139 has 2 divisors, whose sum is σ = 212265140. Its totient is φ = 212265138.

The previous prime is 212265121. The next prime is 212265143. The reversal of 212265139 is 931562212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212265139 - 2⁵ = 212265107 is a prime.

It is equal to p_11719642 and since 212265139 and 11719642 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212265139.

It is not a weakly prime, because it can be changed into another prime (212265149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106132569 + 106132570.

It is an arithmetic number, because the mean of its divisors is an integer number (106132570).

Almost surely, 2^212265139 is an apocalyptic number.

212265139 is a deficient number, since it is larger than the sum of its proper divisors (1).

212265139 is an equidigital number, since it uses as much as digits as its factorization.

212265139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 212265139 is about 14569.3218442040. The cubic root of 212265139 is about 596.5216697005.

The spelling of 212265139 in words is "two hundred twelve million, two hundred sixty-five thousand, one hundred thirty-nine".