213742391 has 2 divisors, whose sum is σ = 213742392. Its totient is φ = 213742390.

The previous prime is 213742337. The next prime is 213742421. The reversal of 213742391 is 193247312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213742391 - 2⁶ = 213742327 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 (213742301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106871195 + 106871196.

It is an arithmetic number, because the mean of its divisors is an integer number (106871196).

Almost surely, 2^213742391 is an apocalyptic number.

213742391 is a deficient number, since it is larger than the sum of its proper divisors (1).

213742391 is an equidigital number, since it uses as much as digits as its factorization.

213742391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 213742391 is about 14619.9312925882. The cubic root of 213742391 is about 597.9022959058.

The spelling of 213742391 in words is "two hundred thirteen million, seven hundred forty-two thousand, three hundred ninety-one".