1055715121 has 4 divisors (see below), whose sum is σ = 1055852644. Its totient is φ = 1055577600.

The previous prime is 1055715091. The next prime is 1055715131. The reversal of 1055715121 is 1215175501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 559984896 + 495730225 = 23664^2 + 22265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055715121 - 2⁹ = 1055714609 is a prime.

It is a super-2 number, since 2×1055715121² = 2229068833416089282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1055715121.

It is not an unprimeable number, because it can be changed into a prime (1055715131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56520 + ... + 72841.

It is an arithmetic number, because the mean of its divisors is an integer number (263963161).

Almost surely, 2^1055715121 is an apocalyptic number.

It is an amenable number.

1055715121 is a deficient number, since it is larger than the sum of its proper divisors (137523).

1055715121 is an equidigital number, since it uses as much as digits as its factorization.

1055715121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137522.

The product of its (nonzero) digits is 1750, while the sum is 28.

The square root of 1055715121 is about 32491.7700502758. The cubic root of 1055715121 is about 1018.2370935830.

The spelling of 1055715121 in words is "one billion, fifty-five million, seven hundred fifteen thousand, one hundred twenty-one".