210145997 has 2 divisors, whose sum is σ = 210145998. Its totient is φ = 210145996.

The previous prime is 210145979. The next prime is 210146003. The reversal of 210145997 is 799541012.

Together with previous prime (210145979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177129481 + 33016516 = 13309^2 + 5746^2 .

It is a cyclic number.

It is not a de Polignac number, because 210145997 - 2¹⁴ = 210129613 is a prime.

It is a super-2 number, since 2×210145997² = 88322680110248018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210145997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210145907) 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 as a sum of consecutive naturals, namely, 105072998 + 105072999.

It is an arithmetic number, because the mean of its divisors is an integer number (105072999).

Almost surely, 2^210145997 is an apocalyptic number.

It is an amenable number.

210145997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210145997 is an equidigital number, since it uses as much as digits as its factorization.

210145997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 210145997 is about 14496.4132460412. The cubic root of 210145997 is about 594.5299085695.

The spelling of 210145997 in words is "two hundred ten million, one hundred forty-five thousand, nine hundred ninety-seven".