123542549 has 12 divisors (see below), whose sum is σ = 134089956. Its totient is φ = 113772672.

The previous prime is 123542543. The next prime is 123542557. The reversal of 123542549 is 945245321.

It can be written as a sum of positive squares in 6 ways, for example, as 19298449 + 104244100 = 4393^2 + 10210^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123542549 is a prime.

It is a super-2 number, since 2×123542549² = 30525522826834802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123542543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143729 + ... + 144585.

It is an arithmetic number, because the mean of its divisors is an integer number (11174163).

Almost surely, 2^123542549 is an apocalyptic number.

It is an amenable number.

123542549 is a deficient number, since it is larger than the sum of its proper divisors (10547407).

123542549 is an equidigital number, since it uses as much as digits as its factorization.

123542549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1723 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 123542549 is about 11114.9695906017. The cubic root of 123542549 is about 498.0491301131.

The spelling of 123542549 in words is "one hundred twenty-three million, five hundred forty-two thousand, five hundred forty-nine".