213579881 has 2 divisors, whose sum is σ = 213579882. Its totient is φ = 213579880.

The previous prime is 213579859. The next prime is 213579901. The reversal of 213579881 is 188975312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211848025 + 1731856 = 14555^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 213579881 - 2¹⁸ = 213317737 is a prime.

It is a super-2 number, since 2×213579881² = 91232731135948322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213579841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106789940 + 106789941.

It is an arithmetic number, because the mean of its divisors is an integer number (106789941).

Almost surely, 2^213579881 is an apocalyptic number.

It is an amenable number.

213579881 is a deficient number, since it is larger than the sum of its proper divisors (1).

213579881 is an equidigital number, since it uses as much as digits as its factorization.

213579881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 213579881 is about 14614.3724121154. The cubic root of 213579881 is about 597.7507275666.

The spelling of 213579881 in words is "two hundred thirteen million, five hundred seventy-nine thousand, eight hundred eighty-one".