1000000155 has 32 divisors (see below), whose sum is σ = 1994807808. Its totient is φ = 415584000.

The previous prime is 1000000123. The next prime is 1000000181. The reversal of 1000000155 is 5510000001.

It is not a de Polignac number, because 1000000155 - 2⁵ = 1000000123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000000155.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 431746 + ... + 434055.

It is an arithmetic number, because the mean of its divisors is an integer number (62337744).

Almost surely, 2^1000000155 is an apocalyptic number.

1000000155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1000000155 is a deficient number, since it is larger than the sum of its proper divisors (994807653).

1000000155 is a wasteful number, since it uses less digits than its factorization.

1000000155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865827.

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 1000000155 is about 31622.7790524489. The cubic root of 1000000155 is about 1000.0000516667. Note that the first 4 decimals are identical.

Adding to 1000000155 its reverse (5510000001), we get a palindrome (6510000156).

It can be divided in two parts, 10000001 and 55, that multiplied together give a palindrome (550000055).

The spelling of 1000000155 in words is "one billion, one hundred fifty-five", and thus it is an aban number.