236997989 has 2 divisors, whose sum is σ = 236997990. Its totient is φ = 236997988.

The previous prime is 236997977. The next prime is 236998009. The reversal of 236997989 is 989799632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166152100 + 70845889 = 12890^2 + 8417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-236997989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236997949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118498994 + 118498995.

It is an arithmetic number, because the mean of its divisors is an integer number (118498995).

Almost surely, 2^236997989 is an apocalyptic number.

It is an amenable number.

236997989 is a deficient number, since it is larger than the sum of its proper divisors (1).

236997989 is an equidigital number, since it uses as much as digits as its factorization.

236997989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 62.

The square root of 236997989 is about 15394.7390039585. The cubic root of 236997989 is about 618.8445258572.

The spelling of 236997989 in words is "two hundred thirty-six million, nine hundred ninety-seven thousand, nine hundred eighty-nine".