121532521531 has 2 divisors, whose sum is σ = 121532521532. Its totient is φ = 121532521530.

The previous prime is 121532521507. The next prime is 121532521601. The reversal of 121532521531 is 135125235121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121532521531 - 2¹¹ = 121532519483 is a prime.

It is a super-2 number, since 2×121532521531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121532521493 and 121532521502.

It is not a weakly prime, because it can be changed into another prime (121532521031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60766260765 + 60766260766.

It is an arithmetic number, because the mean of its divisors is an integer number (60766260766).

Almost surely, 2^121532521531 is an apocalyptic number.

121532521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121532521531 is an equidigital number, since it uses as much as digits as its factorization.

121532521531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

Adding to 121532521531 its reverse (135125235121), we get a palindrome (256657756652).

The spelling of 121532521531 in words is "one hundred twenty-one billion, five hundred thirty-two million, five hundred twenty-one thousand, five hundred thirty-one".