243136639 has 2 divisors, whose sum is σ = 243136640. Its totient is φ = 243136638.

The previous prime is 243136603. The next prime is 243136651. The reversal of 243136639 is 936631342.

243136639 = T₁₂₇₃₀ + T₁₂₇₃₁ + T₁₂₇₃₂.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243136639 - 2⁷ = 243136511 is a prime.

It is a super-3 number, since 3×243136639³ (a number of 26 digits) contains 333 as substring.

It is equal to p_13323979 and since 243136639 and 13323979 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 = 243136598 and 243136607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243136679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121568319 + 121568320.

It is an arithmetic number, because the mean of its divisors is an integer number (121568320).

Almost surely, 2^243136639 is an apocalyptic number.

243136639 is the 12732-nd centered triangular number.

243136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

243136639 is an equidigital number, since it uses as much as digits as its factorization.

243136639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 37.

The square root of 243136639 is about 15592.8393501633. The cubic root of 243136639 is about 624.1420881986.

The spelling of 243136639 in words is "two hundred forty-three million, one hundred thirty-six thousand, six hundred thirty-nine".