1555213 has 6 divisors (see below), whose sum is σ = 1709582. Its totient is φ = 1413720.

The previous prime is 1555199. The next prime is 1555223. The reversal of 1555213 is 3125551.

It can be written as a sum of positive squares in only one way, i.e., 1162084 + 393129 = 1078^2 + 627^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1555213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6306 + ... + 6547.

2^1555213 is an apocalyptic number.

It is an amenable number.

1555213 is a deficient number, since it is larger than the sum of its proper divisors (154369).

1555213 is a wasteful number, since it uses less digits than its factorization.

1555213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12875 (or 12864 counting only the distinct ones).

The product of its digits is 750, while the sum is 22.

The square root of 1555213 is about 1247.0817936286. The cubic root of 1555213 is about 115.8590489749.

The spelling of 1555213 in words is "one million, five hundred fifty-five thousand, two hundred thirteen".