85739513 has 2 divisors, whose sum is σ = 85739514. Its totient is φ = 85739512.

The previous prime is 85739503. The next prime is 85739539. The reversal of 85739513 is 31593758.

85739513 = 6547² + 6548².

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42876304 + 42863209 = 6548^2 + 6547^2 .

It is a cyclic number.

It is not a de Polignac number, because 85739513 - 2⁴ = 85739497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85739503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42869756 + 42869757.

It is an arithmetic number, because the mean of its divisors is an integer number (42869757).

Almost surely, 2^85739513 is an apocalyptic number.

85739513 is the 6548-th centered square number.

It is an amenable number.

85739513 is a deficient number, since it is larger than the sum of its proper divisors (1).

85739513 is an equidigital number, since it uses as much as digits as its factorization.

85739513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 85739513 is about 9259.5633266370. The cubic root of 85739513 is about 440.9543901425.

The spelling of 85739513 in words is "eighty-five million, seven hundred thirty-nine thousand, five hundred thirteen".