213134777 has 2 divisors, whose sum is σ = 213134778. Its totient is φ = 213134776.

The previous prime is 213134759. The next prime is 213134791. The reversal of 213134777 is 777431312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186704896 + 26429881 = 13664^2 + 5141^2 .

It is a cyclic number.

It is not a de Polignac number, because 213134777 - 2¹² = 213130681 is a prime.

It is equal to p_11765078 and since 213134777 and 11765078 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (213134737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106567388 + 106567389.

It is an arithmetic number, because the mean of its divisors is an integer number (106567389).

Almost surely, 2^213134777 is an apocalyptic number.

It is an amenable number.

213134777 is a deficient number, since it is larger than the sum of its proper divisors (1).

213134777 is an equidigital number, since it uses as much as digits as its factorization.

213134777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 35.

The square root of 213134777 is about 14599.1361730754. The cubic root of 213134777 is about 597.3351979792.

The spelling of 213134777 in words is "two hundred thirteen million, one hundred thirty-four thousand, seven hundred seventy-seven".