1630897 has 2 divisors, whose sum is σ = 1630898. Its totient is φ = 1630896.

The previous prime is 1630891. The next prime is 1630913. The reversal of 1630897 is 7980361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 53361 = 1256^2 + 231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630897 is a prime.

1630897 is a lucky number.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (1630891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815448 + 815449.

It is an arithmetic number, because the mean of its divisors is an integer number (815449).

2^1630897 is an apocalyptic number.

It is an amenable number.

1630897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630897 is an equidigital number, since it uses as much as digits as its factorization.

1630897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1630897 is about 1277.0657774759. The cubic root of 1630897 is about 117.7087762498.

The spelling of 1630897 in words is "one million, six hundred thirty thousand, eight hundred ninety-seven".