213506131 has 2 divisors, whose sum is σ = 213506132. Its totient is φ = 213506130.

The previous prime is 213506119. The next prime is 213506141. The reversal of 213506131 is 131605312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213506131 - 2¹⁷ = 213375059 is a prime.

It is a super-2 number, since 2×213506131² = 91169735949178322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213506141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106753065 + 106753066.

It is an arithmetic number, because the mean of its divisors is an integer number (106753066).

Almost surely, 2^213506131 is an apocalyptic number.

213506131 is a deficient number, since it is larger than the sum of its proper divisors (1).

213506131 is an equidigital number, since it uses as much as digits as its factorization.

213506131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 213506131 is about 14611.8489931973. The cubic root of 213506131 is about 597.6819177282.

The spelling of 213506131 in words is "two hundred thirteen million, five hundred six thousand, one hundred thirty-one".