842612509 has 2 divisors, whose sum is σ = 842612510. Its totient is φ = 842612508.

The previous prime is 842612489. The next prime is 842612539. The reversal of 842612509 is 905216248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617522500 + 225090009 = 24850^2 + 15003^2 .

It is a cyclic number.

It is not a de Polignac number, because 842612509 - 2²⁵ = 809058077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842612539) 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, 421306254 + 421306255.

It is an arithmetic number, because the mean of its divisors is an integer number (421306255).

Almost surely, 2^842612509 is an apocalyptic number.

It is an amenable number.

842612509 is a deficient number, since it is larger than the sum of its proper divisors (1).

842612509 is an equidigital number, since it uses as much as digits as its factorization.

842612509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 842612509 is about 29027.7885654419. The cubic root of 842612509 is about 944.5159597575.

The spelling of 842612509 in words is "eight hundred forty-two million, six hundred twelve thousand, five hundred nine".