1011215541 has 16 divisors (see below), whose sum is σ = 1541441664. Its totient is φ = 577634304.

The previous prime is 1011215533. The next prime is 1011215617. The reversal of 1011215541 is 1455121101.

It is not a de Polignac number, because 1011215541 - 2³ = 1011215533 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 (1011215501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69301 + ... + 82613.

It is an arithmetic number, because the mean of its divisors is an integer number (96340104).

Almost surely, 2^1011215541 is an apocalyptic number.

It is an amenable number.

1011215541 is a deficient number, since it is larger than the sum of its proper divisors (530226123).

1011215541 is a wasteful number, since it uses less digits than its factorization.

1011215541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16940.

The product of its (nonzero) digits is 200, while the sum is 21.

The square root of 1011215541 is about 31799.6154222028. The cubic root of 1011215541 is about 1003.7246236219.

Adding to 1011215541 its reverse (1455121101), we get a palindrome (2466336642).

The spelling of 1011215541 in words is "one billion, eleven million, two hundred fifteen thousand, five hundred forty-one".