1225913 has 8 divisors (see below), whose sum is σ = 1330056. Its totient is φ = 1123200.

The previous prime is 1225909. The next prime is 1225919. The reversal of 1225913 is 3195221.

It can be written as a sum of positive squares in 4 ways, for example, as 76729 + 1149184 = 277^2 + 1072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225913 - 2² = 1225909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2093 + ... + 2613.

It is an arithmetic number, because the mean of its divisors is an integer number (166257).

2^1225913 is an apocalyptic number.

1225913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1225913 is a deficient number, since it is larger than the sum of its proper divisors (104143).

1225913 is a wasteful number, since it uses less digits than its factorization.

1225913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its digits is 540, while the sum is 23.

The square root of 1225913 is about 1107.2095555946. The cubic root of 1225913 is about 107.0253237293.

The spelling of 1225913 in words is "one million, two hundred twenty-five thousand, nine hundred thirteen".