1000013555 has 8 divisors (see below), whose sum is σ = 1200584544. Its totient is φ = 799632000.

The previous prime is 1000013537. The next prime is 1000013561. The reversal of 1000013555 is 5553100001.

It is a happy number.

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

It is not a de Polignac number, because 1000013555 - 2²⁰ = 998964979 is a prime.

It is a super-2 number, since 2×1000013555² = 2000054220367476050, which contains 22 as substring.

It is a Duffinian number.

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, 35471 + ... + 57080.

It is an arithmetic number, because the mean of its divisors is an integer number (150073068).

Almost surely, 2^1000013555 is an apocalyptic number.

1000013555 is a deficient number, since it is larger than the sum of its proper divisors (200570989).

1000013555 is an equidigital number, since it uses as much as digits as its factorization.

1000013555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94717.

The product of its (nonzero) digits is 375, while the sum is 20.

The square root of 1000013555 is about 31622.9909243259. The cubic root of 1000013555 is about 1000.0045183129.

Adding to 1000013555 its reverse (5553100001), we get a palindrome (6553113556).

The spelling of 1000013555 in words is "one billion, thirteen thousand, five hundred fifty-five".