870840013 has 2 divisors, whose sum is σ = 870840014. Its totient is φ = 870840012.

The previous prime is 870840001. The next prime is 870840023. The reversal of 870840013 is 310048078.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595213609 + 275626404 = 24397^2 + 16602^2 .

It is a cyclic number.

It is not a de Polignac number, because 870840013 - 2¹³ = 870831821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870840023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435420006 + 435420007.

It is an arithmetic number, because the mean of its divisors is an integer number (435420007).

Almost surely, 2^870840013 is an apocalyptic number.

It is an amenable number.

870840013 is a deficient number, since it is larger than the sum of its proper divisors (1).

870840013 is an equidigital number, since it uses as much as digits as its factorization.

870840013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 870840013 is about 29509.9985259234. The cubic root of 870840013 is about 954.9474174058.

The spelling of 870840013 in words is "eight hundred seventy million, eight hundred forty thousand, thirteen".