210000061 has 4 divisors (see below), whose sum is σ = 210048124. Its totient is φ = 209952000.

The previous prime is 210000047. The next prime is 210000067. The reversal of 210000061 is 160000012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172423161 + 37576900 = 13131^2 + 6130^2 .

It is a 4-Lehmer number, since φ(210000061) divides (210000061-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 210000061 - 2¹⁵ = 209967293 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16740 + ... + 26461.

It is an arithmetic number, because the mean of its divisors is an integer number (52512031).

Almost surely, 2^210000061 is an apocalyptic number.

It is an amenable number.

210000061 is a deficient number, since it is larger than the sum of its proper divisors (48063).

210000061 is an equidigital number, since it uses as much as digits as its factorization.

210000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48062.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 210000061 is about 14491.3788508892. The cubic root of 210000061 is about 594.3922528286.

Adding to 210000061 its reverse (160000012), we get a palindrome (370000073).

The spelling of 210000061 in words is "two hundred ten million, sixty-one", and thus it is an aban number.