210256013 has 6 divisors (see below), whose sum is σ = 231107982. Its totient is φ = 191141720.

The previous prime is 210255979. The next prime is 210256027. The reversal of 210256013 is 310652012.

It can be written as a sum of positive squares in only one way, i.e., 210192004 + 64009 = 14498^2 + 253^2 .

It is not a de Polignac number, because 210256013 - 2⁸ = 210255757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210256073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 868706 + ... + 868947.

It is an arithmetic number, because the mean of its divisors is an integer number (38517997).

Almost surely, 2^210256013 is an apocalyptic number.

It is an amenable number.

210256013 is a deficient number, since it is larger than the sum of its proper divisors (20851969).

210256013 is a wasteful number, since it uses less digits than its factorization.

210256013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737675 (or 1737664 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 210256013 is about 14500.2073433451. The cubic root of 210256013 is about 594.6336402490.

The spelling of 210256013 in words is "two hundred ten million, two hundred fifty-six thousand, thirteen".