1011115623 has 16 divisors (see below), whose sum is σ = 1590450176. Its totient is φ = 559141920.

The previous prime is 1011115603. The next prime is 1011115657. The reversal of 1011115623 is 3265111101.

It is a happy number.

1011115623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1011115623 - 2¹⁶ = 1011050087 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1011115623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011115603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775936 + ... + 777237.

It is an arithmetic number, because the mean of its divisors is an integer number (99403136).

Almost surely, 2^1011115623 is an apocalyptic number.

1011115623 is a deficient number, since it is larger than the sum of its proper divisors (579334553).

1011115623 is a wasteful number, since it uses less digits than its factorization.

1011115623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553214.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1011115623 is about 31798.0443266563. The cubic root of 1011115623 is about 1003.6915632583.

Adding to 1011115623 its reverse (3265111101), we get a palindrome (4276226724).

The spelling of 1011115623 in words is "one billion, eleven million, one hundred fifteen thousand, six hundred twenty-three".