1531665212 has 48 divisors (see below), whose sum is σ = 3368214528. Its totient is φ = 592038720.

The previous prime is 1531665173. The next prime is 1531665241. The reversal of 1531665212 is 2125661351.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19538 + ... + 58694.

It is an arithmetic number, because the mean of its divisors is an integer number (70171136).

Almost surely, 2^1531665212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1531665212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1684107264).

1531665212 is an abundant number, since it is smaller than the sum of its proper divisors (1836549316).

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

1531665212 is a wasteful number, since it uses less digits than its factorization.

1531665212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39306 (or 39304 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 1531665212 is about 39136.4946309707. The cubic root of 1531665212 is about 1152.7132436526.

The spelling of 1531665212 in words is "one billion, five hundred thirty-one million, six hundred sixty-five thousand, two hundred twelve".