210612139 has 2 divisors, whose sum is σ = 210612140. Its totient is φ = 210612138.

The previous prime is 210612119. The next prime is 210612161. The reversal of 210612139 is 931216012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210612139 - 2⁷ = 210612011 is a prime.

It is not a weakly prime, because it can be changed into another prime (210612119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105306069 + 105306070.

It is an arithmetic number, because the mean of its divisors is an integer number (105306070).

Almost surely, 2^210612139 is an apocalyptic number.

210612139 is a deficient number, since it is larger than the sum of its proper divisors (1).

210612139 is an equidigital number, since it uses as much as digits as its factorization.

210612139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 210612139 is about 14512.4821791450. The cubic root of 210612139 is about 594.9691757211.

The spelling of 210612139 in words is "two hundred ten million, six hundred twelve thousand, one hundred thirty-nine".