212391349 has 2 divisors, whose sum is σ = 212391350. Its totient is φ = 212391348.

The previous prime is 212391301. The next prime is 212391391. The reversal of 212391349 is 943193212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173765124 + 38626225 = 13182^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 212391349 - 2¹⁷ = 212260277 is a prime.

It is a super-2 number, since 2×212391349² = 90220170260079602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212391649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106195674 + 106195675.

It is an arithmetic number, because the mean of its divisors is an integer number (106195675).

Almost surely, 2^212391349 is an apocalyptic number.

It is an amenable number.

212391349 is a deficient number, since it is larger than the sum of its proper divisors (1).

212391349 is an equidigital number, since it uses as much as digits as its factorization.

212391349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 212391349 is about 14573.6525620724. The cubic root of 212391349 is about 596.6398741996.

The spelling of 212391349 in words is "two hundred twelve million, three hundred ninety-one thousand, three hundred forty-nine".