210981497 has 2 divisors, whose sum is σ = 210981498. Its totient is φ = 210981496.

The previous prime is 210981487. The next prime is 210981503. The reversal of 210981497 is 794189012.

210981497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 72777961 = 11756^2 + 8531^2 .

It is a cyclic number.

It is not a de Polignac number, because 210981497 - 2⁴ = 210981481 is a prime.

It is a super-2 number, since 2×210981497² = 89026384152722018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210981427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105490748 + 105490749.

It is an arithmetic number, because the mean of its divisors is an integer number (105490749).

Almost surely, 2^210981497 is an apocalyptic number.

It is an amenable number.

210981497 is a deficient number, since it is larger than the sum of its proper divisors (1).

210981497 is an equidigital number, since it uses as much as digits as its factorization.

210981497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 210981497 is about 14525.2021328448. The cubic root of 210981497 is about 595.3167788015.

The spelling of 210981497 in words is "two hundred ten million, nine hundred eighty-one thousand, four hundred ninety-seven".