213143477 has 2 divisors, whose sum is σ = 213143478. Its totient is φ = 213143476.

The previous prime is 213143471. The next prime is 213143521. The reversal of 213143477 is 774341312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139972561 + 73170916 = 11831^2 + 8554^2 .

It is a cyclic number.

It is not a de Polignac number, because 213143477 - 2⁸ = 213143221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213143471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106571738 + 106571739.

It is an arithmetic number, because the mean of its divisors is an integer number (106571739).

Almost surely, 2^213143477 is an apocalyptic number.

It is an amenable number.

213143477 is a deficient number, since it is larger than the sum of its proper divisors (1).

213143477 is an equidigital number, since it uses as much as digits as its factorization.

213143477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 32.

The square root of 213143477 is about 14599.4341328697. The cubic root of 213143477 is about 597.3433254586.

Adding to 213143477 its reverse (774341312), we get a palindrome (987484789).

The spelling of 213143477 in words is "two hundred thirteen million, one hundred forty-three thousand, four hundred seventy-seven".