651212532 has 18 divisors (see below), whose sum is σ = 1646120658. Its totient is φ = 217070832.

The previous prime is 651212531. The next prime is 651212539. The reversal of 651212532 is 235212156.

It is a happy number.

651212532 is a `hidden beast` number, since 6 + 5 + 121 + 2 + 532 = 666.

It can be written as a sum of positive squares in only one way, i.e., 609299856 + 41912676 = 24684^2 + 6474^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 651212496 and 651212505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651212531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9044583 + ... + 9044654.

Almost surely, 2^651212532 is an apocalyptic number.

It is an amenable number.

651212532 is an abundant number, since it is smaller than the sum of its proper divisors (994908126).

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

651212532 is a wasteful number, since it uses less digits than its factorization.

651212532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18089247 (or 18089242 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 651212532 is about 25518.8661973842. The cubic root of 651212532 is about 866.7774080055. Note that the first 3 decimals are identical.

Adding to 651212532 its reverse (235212156), we get a palindrome (886424688).

It can be divided in two parts, 6512 and 12532, that added together give a square (19044 = 138²).

The spelling of 651212532 in words is "six hundred fifty-one million, two hundred twelve thousand, five hundred thirty-two".