961836509 has 2 divisors, whose sum is σ = 961836510. Its totient is φ = 961836508.

The previous prime is 961836437. The next prime is 961836511. The reversal of 961836509 is 905638169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 940648900 + 21187609 = 30670^2 + 4603^2 .

It is a cyclic number.

It is not a de Polignac number, because 961836509 - 2¹² = 961832413 is a prime.

It is a Sophie Germain prime.

Together with 961836511, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961836559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480918254 + 480918255.

It is an arithmetic number, because the mean of its divisors is an integer number (480918255).

Almost surely, 2^961836509 is an apocalyptic number.

It is an amenable number.

961836509 is a deficient number, since it is larger than the sum of its proper divisors (1).

961836509 is an equidigital number, since it uses as much as digits as its factorization.

961836509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 961836509 is about 31013.4891458539. The cubic root of 961836509 is about 987.1134874485.

The spelling of 961836509 in words is "nine hundred sixty-one million, eight hundred thirty-six thousand, five hundred nine".