1005542123 has 4 divisors (see below), whose sum is σ = 1006390440. Its totient is φ = 1004693808.

The previous prime is 1005542119. The next prime is 1005542137. The reversal of 1005542123 is 3212455001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1005542123 - 2² = 1005542119 is a prime.

It is a super-2 number, since 2×1005542123² = 2022229922254694258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005542173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422378 + ... + 424751.

It is an arithmetic number, because the mean of its divisors is an integer number (251597610).

Almost surely, 2^1005542123 is an apocalyptic number.

1005542123 is a deficient number, since it is larger than the sum of its proper divisors (848317).

1005542123 is an equidigital number, since it uses as much as digits as its factorization.

1005542123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848316.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1005542123 is about 31710.2841835263. The cubic root of 1005542123 is about 1001.8439720106.

Adding to 1005542123 its reverse (3212455001), we get a palindrome (4217997124).

The spelling of 1005542123 in words is "one billion, five million, five hundred forty-two thousand, one hundred twenty-three".