162531521 has 2 divisors, whose sum is σ = 162531522. Its totient is φ = 162531520.

The previous prime is 162531517. The next prime is 162531527. The reversal of 162531521 is 125135261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 15249025 = 12136^2 + 3905^2 .

It is a cyclic number.

It is not a de Polignac number, because 162531521 - 2² = 162531517 is a prime.

It is not a weakly prime, because it can be changed into another prime (162531527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81265760 + 81265761.

It is an arithmetic number, because the mean of its divisors is an integer number (81265761).

Almost surely, 2^162531521 is an apocalyptic number.

It is an amenable number.

162531521 is a deficient number, since it is larger than the sum of its proper divisors (1).

162531521 is an equidigital number, since it uses as much as digits as its factorization.

162531521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 162531521 is about 12748.7850793713. The cubic root of 162531521 is about 545.7317231418.

Adding to 162531521 its reverse (125135261), we get a palindrome (287666782).

The spelling of 162531521 in words is "one hundred sixty-two million, five hundred thirty-one thousand, five hundred twenty-one".