123520531 has 2 divisors, whose sum is σ = 123520532. Its totient is φ = 123520530.

The previous prime is 123520499. The next prime is 123520583. The reversal of 123520531 is 135025321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123520531 - 2⁵ = 123520499 is a prime.

It is a super-2 number, since 2×123520531² = 30514643157043922, which contains 22 as substring.

It is equal to p_7030624 and since 123520531 and 7030624 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (123520591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760265 + 61760266.

It is an arithmetic number, because the mean of its divisors is an integer number (61760266).

Almost surely, 2^123520531 is an apocalyptic number.

123520531 is a deficient number, since it is larger than the sum of its proper divisors (1).

123520531 is an equidigital number, since it uses as much as digits as its factorization.

123520531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 123520531 is about 11113.9790804194. The cubic root of 123520531 is about 498.0195405847.

Adding to 123520531 its reverse (135025321), we get a palindrome (258545852).

The spelling of 123520531 in words is "one hundred twenty-three million, five hundred twenty thousand, five hundred thirty-one".