689040013 has 2 divisors, whose sum is σ = 689040014. Its totient is φ = 689040012.

The previous prime is 689039983. The next prime is 689040059. The reversal of 689040013 is 310040986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572788489 + 116251524 = 23933^2 + 10782^2 .

It is a cyclic number.

It is not a de Polignac number, because 689040013 - 2¹³ = 689031821 is a prime.

It is a super-2 number, since 2×689040013² = 949552279030080338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689049013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344520006 + 344520007.

It is an arithmetic number, because the mean of its divisors is an integer number (344520007).

Almost surely, 2^689040013 is an apocalyptic number.

It is an amenable number.

689040013 is a deficient number, since it is larger than the sum of its proper divisors (1).

689040013 is an equidigital number, since it uses as much as digits as its factorization.

689040013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 689040013 is about 26249.5716726959. The cubic root of 689040013 is about 883.2455963014.

Adding to 689040013 its reverse (310040986), we get a palindrome (999080999).

The spelling of 689040013 in words is "six hundred eighty-nine million, forty thousand, thirteen".