151221533 has 2 divisors, whose sum is σ = 151221534. Its totient is φ = 151221532.

The previous prime is 151221529. The next prime is 151221541. The reversal of 151221533 is 335122151.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151117849 + 103684 = 12293^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 151221533 - 2² = 151221529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151221499 and 151221508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151221593) 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 as a sum of consecutive naturals, namely, 75610766 + 75610767.

It is an arithmetic number, because the mean of its divisors is an integer number (75610767).

Almost surely, 2^151221533 is an apocalyptic number.

It is an amenable number.

151221533 is a deficient number, since it is larger than the sum of its proper divisors (1).

151221533 is an equidigital number, since it uses as much as digits as its factorization.

151221533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 151221533 is about 12297.2164736578. The cubic root of 151221533 is about 532.7676898410.

Adding to 151221533 its reverse (335122151), we get a palindrome (486343684).

The spelling of 151221533 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred thirty-three".