1055721117 has 16 divisors (see below), whose sum is σ = 1540611072. Its totient is φ = 637740720.

The previous prime is 1055721113. The next prime is 1055721127. The reversal of 1055721117 is 7111275501.

It is not a de Polignac number, because 1055721117 - 2² = 1055721113 is a prime.

It is a super-2 number, since 2×1055721117² = 2229094153759455378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055721113) 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, 41973 + ... + 62234.

It is an arithmetic number, because the mean of its divisors is an integer number (96288192).

Almost surely, 2^1055721117 is an apocalyptic number.

It is an amenable number.

1055721117 is a deficient number, since it is larger than the sum of its proper divisors (484889955).

1055721117 is a wasteful number, since it uses less digits than its factorization.

1055721117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104528.

The product of its (nonzero) digits is 2450, while the sum is 30.

The square root of 1055721117 is about 32491.8623196640. The cubic root of 1055721117 is about 1018.2390212931.

Adding to 1055721117 its reverse (7111275501), we get a palindrome (8166996618).

The spelling of 1055721117 in words is "one billion, fifty-five million, seven hundred twenty-one thousand, one hundred seventeen".