236890609 has 2 divisors, whose sum is σ = 236890610. Its totient is φ = 236890608.

The previous prime is 236890603. The next prime is 236890649. The reversal of 236890609 is 906098632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160275600 + 76615009 = 12660^2 + 8753^2 .

It is a cyclic number.

It is not a de Polignac number, because 236890609 - 2⁹ = 236890097 is a prime.

It is a super-2 number, since 2×236890609² = 112234321264781762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (236890603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118445304 + 118445305.

It is an arithmetic number, because the mean of its divisors is an integer number (118445305).

Almost surely, 2^236890609 is an apocalyptic number.

It is an amenable number.

236890609 is a deficient number, since it is larger than the sum of its proper divisors (1).

236890609 is an equidigital number, since it uses as much as digits as its factorization.

236890609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 236890609 is about 15391.2510537643. The cubic root of 236890609 is about 618.7510488844.

The spelling of 236890609 in words is "two hundred thirty-six million, eight hundred ninety thousand, six hundred nine".