123420529 has 2 divisors, whose sum is σ = 123420530. Its totient is φ = 123420528.

The previous prime is 123420509. The next prime is 123420533. The reversal of 123420529 is 925024321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118222129 + 5198400 = 10873^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 123420529 - 2²³ = 115031921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123420497 and 123420506.

It is not a weakly prime, because it can be changed into another prime (123420509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61710264 + 61710265.

It is an arithmetic number, because the mean of its divisors is an integer number (61710265).

Almost surely, 2^123420529 is an apocalyptic number.

It is an amenable number.

123420529 is a deficient number, since it is larger than the sum of its proper divisors (1).

123420529 is an equidigital number, since it uses as much as digits as its factorization.

123420529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 123420529 is about 11109.4792407205. The cubic root of 123420529 is about 497.8851057237.

The spelling of 123420529 in words is "one hundred twenty-three million, four hundred twenty thousand, five hundred twenty-nine".