1561212 has 36 divisors (see below), whose sum is σ = 4180176. Its totient is φ = 489600.

The previous prime is 1561193. The next prime is 1561213. The reversal of 1561212 is 2121651.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

1561212 is a modest number, since divided by 1212 gives 156 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561213) 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 11 ways as a sum of consecutive naturals, for example, 664 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (116116).

2^1561212 is an apocalyptic number.

1561212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561212 is an abundant number, since it is smaller than the sum of its proper divisors (2618964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561212 is a wasteful number, since it uses less digits than its factorization.

1561212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578 (or 2573 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 1561212 is about 1249.4846937838. The cubic root of 1561212 is about 116.0078274544.

Adding to 1561212 its reverse (2121651), we get a palindrome (3682863).

The spelling of 1561212 in words is "one million, five hundred sixty-one thousand, two hundred twelve".