1225513 has 4 divisors (see below), whose sum is σ = 1297620. Its totient is φ = 1153408.

The previous prime is 1225507. The next prime is 1225517. The reversal of 1225513 is 3155221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 946729 + 278784 = 973^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225513 - 2¹⁷ = 1094441 is a prime.

It is a super-2 number, since 2×1225513² = 3003764226338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36028 + ... + 36061.

It is an arithmetic number, because the mean of its divisors is an integer number (324405).

2^1225513 is an apocalyptic number.

It is an amenable number.

1225513 is a deficient number, since it is larger than the sum of its proper divisors (72107).

1225513 is an equidigital number, since it uses as much as digits as its factorization.

1225513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72106.

The product of its digits is 300, while the sum is 19.

The square root of 1225513 is about 1107.0289065783. The cubic root of 1225513 is about 107.0136821238.

It can be divided in two parts, 122551 and 3, that multiplied together give a triangular number (367653 = T₈₅₇).

The spelling of 1225513 in words is "one million, two hundred twenty-five thousand, five hundred thirteen".