612533521 has 2 divisors, whose sum is σ = 612533522. Its totient is φ = 612533520.

The previous prime is 612533473. The next prime is 612533549. The reversal of 612533521 is 125335216.

It is an a-pointer prime, because the next prime (612533549) can be obtained adding 612533521 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439321600 + 173211921 = 20960^2 + 13161^2 .

It is a cyclic number.

It is not a de Polignac number, because 612533521 - 2⁷ = 612533393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612533521.

It is not a weakly prime, because it can be changed into another prime (612533821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306266760 + 306266761.

It is an arithmetic number, because the mean of its divisors is an integer number (306266761).

Almost surely, 2^612533521 is an apocalyptic number.

It is an amenable number.

612533521 is a deficient number, since it is larger than the sum of its proper divisors (1).

612533521 is an equidigital number, since it uses as much as digits as its factorization.

612533521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 612533521 is about 24749.4145587325. The cubic root of 612533521 is about 849.2651184624.

Adding to 612533521 its reverse (125335216), we get a palindrome (737868737).

The spelling of 612533521 in words is "six hundred twelve million, five hundred thirty-three thousand, five hundred twenty-one".