212554409 has 2 divisors, whose sum is σ = 212554410. Its totient is φ = 212554408.

The previous prime is 212554379. The next prime is 212554421. The reversal of 212554409 is 904455212.

212554409 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 can be written as a sum of positive squares in only one way, i.e., 122589184 + 89965225 = 11072^2 + 9485^2 .

It is a cyclic number.

It is not a de Polignac number, because 212554409 - 2¹² = 212550313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212554429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106277204 + 106277205.

It is an arithmetic number, because the mean of its divisors is an integer number (106277205).

Almost surely, 2^212554409 is an apocalyptic number.

It is an amenable number.

212554409 is a deficient number, since it is larger than the sum of its proper divisors (1).

212554409 is an equidigital number, since it uses as much as digits as its factorization.

212554409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 212554409 is about 14579.2458309749. The cubic root of 212554409 is about 596.7925219916.

The spelling of 212554409 in words is "two hundred twelve million, five hundred fifty-four thousand, four hundred nine".