897209251 has 2 divisors, whose sum is σ = 897209252. Its totient is φ = 897209250.

The previous prime is 897209239. The next prime is 897209293. The reversal of 897209251 is 152902798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 897209251 - 2⁵ = 897209219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 897209198 and 897209207.

It is not a weakly prime, because it can be changed into another prime (897209851) 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, 448604625 + 448604626.

It is an arithmetic number, because the mean of its divisors is an integer number (448604626).

Almost surely, 2^897209251 is an apocalyptic number.

897209251 is a deficient number, since it is larger than the sum of its proper divisors (1).

897209251 is an equidigital number, since it uses as much as digits as its factorization.

897209251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 897209251 is about 29953.4514038032. The cubic root of 897209251 is about 964.4904111453.

The spelling of 897209251 in words is "eight hundred ninety-seven million, two hundred nine thousand, two hundred fifty-one".