1000243155 has 8 divisors (see below), whose sum is σ = 1600389072. Its totient is φ = 533463008.

The previous prime is 1000243121. The next prime is 1000243193. The reversal of 1000243155 is 5513420001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000243155 - 2⁸ = 1000242899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33341424 + ... + 33341453.

It is an arithmetic number, because the mean of its divisors is an integer number (200048634).

Almost surely, 2^1000243155 is an apocalyptic number.

1000243155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1000243155 is a deficient number, since it is larger than the sum of its proper divisors (600145917).

1000243155 is an equidigital number, since it uses as much as digits as its factorization.

1000243155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66682885.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1000243155 is about 31626.6209861250. The cubic root of 1000243155 is about 1000.0810450982.

Adding to 1000243155 its reverse (5513420001), we get a palindrome (6513663156).

The spelling of 1000243155 in words is "one billion, two hundred forty-three thousand, one hundred fifty-five".