1054111721 has 4 divisors (see below), whose sum is σ = 1135197252. Its totient is φ = 973026192.

The previous prime is 1054111717. The next prime is 1054111757. The reversal of 1054111721 is 1271114501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1271114501 = 2689 ⋅472709.

It can be written as a sum of positive squares in 2 ways, for example, as 339886096 + 714225625 = 18436^2 + 26725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1054111721 - 2² = 1054111717 is a prime.

It is a super-2 number, since 2×1054111721² = 2222303040699163682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1054111771) 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, 40542746 + ... + 40542771.

It is an arithmetic number, because the mean of its divisors is an integer number (283799313).

Almost surely, 2^1054111721 is an apocalyptic number.

It is an amenable number.

1054111721 is a deficient number, since it is larger than the sum of its proper divisors (81085531).

1054111721 is an equidigital number, since it uses as much as digits as its factorization.

1054111721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81085530.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 1054111721 is about 32467.0867341066. The cubic root of 1054111721 is about 1017.7213393601.

The spelling of 1054111721 in words is "one billion, fifty-four million, one hundred eleven thousand, seven hundred twenty-one".