1225997 has 2 divisors, whose sum is σ = 1225998. Its totient is φ = 1225996.

The previous prime is 1225981. The next prime is 1225999. The reversal of 1225997 is 7995221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687241 + 538756 = 829^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225997 - 2⁴ = 1225981 is a prime.

Together with 1225999, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 2⁴ + 2²⁰ + 5⁴ + 9² + 9⁵ + 7⁶ .

It is equal to p₉₄₇₆₉ and since 1225997 and 94769 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612998 + 612999.

It is an arithmetic number, because the mean of its divisors is an integer number (612999).

2^1225997 is an apocalyptic number.

It is an amenable number.

1225997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225997 is an equidigital number, since it uses as much as digits as its factorization.

1225997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The square root of 1225997 is about 1107.2474881435. The cubic root of 1225997 is about 107.0277681447.

It can be divided in two parts, 1225 and 997, that added together give a palindrome (2222).

The spelling of 1225997 in words is "one million, two hundred twenty-five thousand, nine hundred ninety-seven".