213132991 has 2 divisors, whose sum is σ = 213132992. Its totient is φ = 213132990.

The previous prime is 213132923. The next prime is 213133003. The reversal of 213132991 is 199231312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213132991 - 2¹¹ = 213130943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213132911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106566495 + 106566496.

It is an arithmetic number, because the mean of its divisors is an integer number (106566496).

Almost surely, 2^213132991 is an apocalyptic number.

213132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

213132991 is an equidigital number, since it uses as much as digits as its factorization.

213132991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 213132991 is about 14599.0750049447. The cubic root of 213132991 is about 597.3335294831. Note that the first 3 decimals are identical.

The spelling of 213132991 in words is "two hundred thirteen million, one hundred thirty-two thousand, nine hundred ninety-one".