213819157 has 2 divisors, whose sum is σ = 213819158. Its totient is φ = 213819156.

The previous prime is 213819107. The next prime is 213819163. The reversal of 213819157 is 751918312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166126321 + 47692836 = 12889^2 + 6906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213819157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213819107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106909578 + 106909579.

It is an arithmetic number, because the mean of its divisors is an integer number (106909579).

Almost surely, 2^213819157 is an apocalyptic number.

It is an amenable number.

213819157 is a deficient number, since it is larger than the sum of its proper divisors (1).

213819157 is an equidigital number, since it uses as much as digits as its factorization.

213819157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 213819157 is about 14622.5564454373. The cubic root of 213819157 is about 597.9738665999.

The spelling of 213819157 in words is "two hundred thirteen million, eight hundred nineteen thousand, one hundred fifty-seven".