3121530 has 32 divisors (see below), whose sum is σ = 7608384. Its totient is φ = 819456.

The previous prime is 3121519. The next prime is 3121543. The reversal of 3121530 is 351213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1234 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (237762).

Almost surely, 2^3121530 is an apocalyptic number.

3121530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3804192).

3121530 is an abundant number, since it is smaller than the sum of its proper divisors (4486854).

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

3121530 is a wasteful number, since it uses less digits than its factorization.

3121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 3121530 is about 1766.7852161482. The cubic root of 3121530 is about 146.1467530473.

Adding to 3121530 its reverse (351213), we get a palindrome (3472743).

The spelling of 3121530 in words is "three million, one hundred twenty-one thousand, five hundred thirty".