213655457 has 2 divisors, whose sum is σ = 213655458. Its totient is φ = 213655456.

The previous prime is 213655423. The next prime is 213655459. The reversal of 213655457 is 754556312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142826401 + 70829056 = 11951^2 + 8416^2 .

It is a cyclic number.

It is not a de Polignac number, because 213655457 - 2²⁰ = 212606881 is a prime.

Together with 213655459, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 213655457 parts by 20671 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 213655457.

It is not a weakly prime, because it can be changed into another prime (213655459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106827728 + 106827729.

It is an arithmetic number, because the mean of its divisors is an integer number (106827729).

Almost surely, 2^213655457 is an apocalyptic number.

It is an amenable number.

213655457 is a deficient number, since it is larger than the sum of its proper divisors (1).

213655457 is an equidigital number, since it uses as much as digits as its factorization.

213655457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 38.

The square root of 213655457 is about 14616.9578572287. The cubic root of 213655457 is about 597.8212246585.

The spelling of 213655457 in words is "two hundred thirteen million, six hundred fifty-five thousand, four hundred fifty-seven".