213731047 has 2 divisors, whose sum is σ = 213731048. Its totient is φ = 213731046.

The previous prime is 213731041. The next prime is 213731051. The reversal of 213731047 is 740137312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213731047 - 2²⁷ = 79513319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213731041) 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, 106865523 + 106865524.

It is an arithmetic number, because the mean of its divisors is an integer number (106865524).

Almost surely, 2^213731047 is an apocalyptic number.

213731047 is a deficient number, since it is larger than the sum of its proper divisors (1).

213731047 is an equidigital number, since it uses as much as digits as its factorization.

213731047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 213731047 is about 14619.5433239209. The cubic root of 213731047 is about 597.8917181824.

Adding to 213731047 its reverse (740137312), we get a palindrome (953868359).

The spelling of 213731047 in words is "two hundred thirteen million, seven hundred thirty-one thousand, forty-seven".