30897457 has 2 divisors, whose sum is σ = 30897458. Its totient is φ = 30897456.

The previous prime is 30897437. The next prime is 30897481. The reversal of 30897457 is 75479803.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 2178576 = 5359^2 + 1476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30897457 is a prime.

It is not a weakly prime, because it can be changed into another prime (30897407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15448728 + 15448729.

It is an arithmetic number, because the mean of its divisors is an integer number (15448729).

Almost surely, 2^30897457 is an apocalyptic number.

It is an amenable number.

30897457 is a deficient number, since it is larger than the sum of its proper divisors (1).

30897457 is an equidigital number, since it uses as much as digits as its factorization.

30897457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 30897457 is about 5558.5481017978. The cubic root of 30897457 is about 313.7913099366.

The spelling of 30897457 in words is "thirty million, eight hundred ninety-seven thousand, four hundred fifty-seven".