1011100155 has 16 divisors (see below), whose sum is σ = 1742203680. Its totient is φ = 497772288.

The previous prime is 1011100127. The next prime is 1011100199. The reversal of 1011100155 is 5510011101.

It is not a de Polignac number, because 1011100155 - 2⁶ = 1011100091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2592370 + ... + 2592759.

It is an arithmetic number, because the mean of its divisors is an integer number (108887730).

Almost surely, 2^1011100155 is an apocalyptic number.

1011100155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1011100155 is a deficient number, since it is larger than the sum of its proper divisors (731103525).

1011100155 is a wasteful number, since it uses less digits than its factorization.

1011100155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185150.

The product of its (nonzero) digits is 25, while the sum is 15.

The square root of 1011100155 is about 31797.8011032210. The cubic root of 1011100155 is about 1003.6864450898.

Adding to 1011100155 its reverse (5510011101), we get a palindrome (6521111256).

The spelling of 1011100155 in words is "one billion, eleven million, one hundred thousand, one hundred fifty-five".