210028997 has 2 divisors, whose sum is σ = 210028998. Its totient is φ = 210028996.

The previous prime is 210028943. The next prime is 210029003. The reversal of 210028997 is 799820012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120802081 + 89226916 = 10991^2 + 9446^2 .

It is a cyclic number.

It is not a de Polignac number, because 210028997 - 2¹² = 210024901 is a prime.

It is a super-2 number, since 2×210028997² = 88224359161652018, 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 210028997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210025997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105014498 + 105014499.

It is an arithmetic number, because the mean of its divisors is an integer number (105014499).

Almost surely, 2^210028997 is an apocalyptic number.

It is an amenable number.

210028997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210028997 is an equidigital number, since it uses as much as digits as its factorization.

210028997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 210028997 is about 14492.3772032058. The cubic root of 210028997 is about 594.4195520973.

The spelling of 210028997 in words is "two hundred ten million, twenty-eight thousand, nine hundred ninety-seven".