213956447 has 2 divisors, whose sum is σ = 213956448. Its totient is φ = 213956446.

The previous prime is 213956437. The next prime is 213956453. The reversal of 213956447 is 744659312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213956447 - 2¹⁴ = 213940063 is a prime.

It is a super-2 number, since 2×213956447² = 91554722425727618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213956437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106978223 + 106978224.

It is an arithmetic number, because the mean of its divisors is an integer number (106978224).

Almost surely, 2^213956447 is an apocalyptic number.

213956447 is a deficient number, since it is larger than the sum of its proper divisors (1).

213956447 is an equidigital number, since it uses as much as digits as its factorization.

213956447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 213956447 is about 14627.2501516861. The cubic root of 213956447 is about 598.1018224993.

The spelling of 213956447 in words is "two hundred thirteen million, nine hundred fifty-six thousand, four hundred forty-seven".