123021539 has 2 divisors, whose sum is σ = 123021540. Its totient is φ = 123021538.

The previous prime is 123021529. The next prime is 123021551. The reversal of 123021539 is 935120321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123021539 - 2¹² = 123017443 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123021529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510769 + 61510770.

It is an arithmetic number, because the mean of its divisors is an integer number (61510770).

Almost surely, 2^123021539 is an apocalyptic number.

123021539 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021539 is an equidigital number, since it uses as much as digits as its factorization.

123021539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 123021539 is about 11091.5075170150. The cubic root of 123021539 is about 497.3480107751.

The spelling of 123021539 in words is "one hundred twenty-three million, twenty-one thousand, five hundred thirty-nine".