209464231 has 2 divisors, whose sum is σ = 209464232. Its totient is φ = 209464230.

The previous prime is 209464207. The next prime is 209464237. The reversal of 209464231 is 132464902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209464231 is a prime.

It is a super-2 number, since 2×209464231² = 87750528136842722, which contains 22 as substring.

It is equal to p_11573545 and since 209464231 and 11573545 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 209464193 and 209464202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209464237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104732115 + 104732116.

It is an arithmetic number, because the mean of its divisors is an integer number (104732116).

Almost surely, 2^209464231 is an apocalyptic number.

209464231 is a deficient number, since it is larger than the sum of its proper divisors (1).

209464231 is an equidigital number, since it uses as much as digits as its factorization.

209464231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 209464231 is about 14472.8791537828. The cubic root of 209464231 is about 593.8862776240.

The spelling of 209464231 in words is "two hundred nine million, four hundred sixty-four thousand, two hundred thirty-one".