961262009 has 2 divisors, whose sum is σ = 961262010. Its totient is φ = 961262008.

The previous prime is 961261997. The next prime is 961262011. The reversal of 961262009 is 900262169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521437225 + 439824784 = 22835^2 + 20972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961262009 is a prime.

Together with 961262011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961262009.

It is not a weakly prime, because it can be changed into another prime (961262039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480631004 + 480631005.

It is an arithmetic number, because the mean of its divisors is an integer number (480631005).

Almost surely, 2^961262009 is an apocalyptic number.

It is an amenable number.

961262009 is a deficient number, since it is larger than the sum of its proper divisors (1).

961262009 is an equidigital number, since it uses as much as digits as its factorization.

961262009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 961262009 is about 31004.2256636091. The cubic root of 961262009 is about 986.9169157031.

The spelling of 961262009 in words is "nine hundred sixty-one million, two hundred sixty-two thousand, nine".