1115551101 has 24 divisors (see below), whose sum is σ = 1832025600. Its totient is φ = 599958912.

The previous prime is 1115551081. The next prime is 1115551117. The reversal of 1115551101 is 1011555111.

It is not a de Polignac number, because 1115551101 - 2¹⁰ = 1115550077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115551121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220701 + ... + 225698.

It is an arithmetic number, because the mean of its divisors is an integer number (76334400).

Almost surely, 2^1115551101 is an apocalyptic number.

It is an amenable number.

1115551101 is a deficient number, since it is larger than the sum of its proper divisors (716474499).

1115551101 is a wasteful number, since it uses less digits than its factorization.

1115551101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446433 (or 446426 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 21.

The square root of 1115551101 is about 33399.8667811714. The cubic root of 1115551101 is about 1037.1219431771.

It can be divided in two parts, 111555110 and 1, that added together give a palindrome (111555111).

The spelling of 1115551101 in words is "one billion, one hundred fifteen million, five hundred fifty-one thousand, one hundred one".