1051721453 has 8 divisors (see below), whose sum is σ = 1108517400. Its totient is φ = 996294208.

The previous prime is 1051721393. The next prime is 1051721471. The reversal of 1051721453 is 3541271501.

It can be written as a sum of positive squares in 4 ways, for example, as 233875849 + 817845604 = 15293^2 + 28598^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1051721453 - 2⁶ = 1051721389 is a prime.

It is a super-2 number, since 2×1051721453² = 2212236029400862418, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051121453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340598 + ... + 343671.

It is an arithmetic number, because the mean of its divisors is an integer number (138564675).

Almost surely, 2^1051721453 is an apocalyptic number.

It is an amenable number.

1051721453 is a deficient number, since it is larger than the sum of its proper divisors (56795947).

1051721453 is an equidigital number, since it uses as much as digits as its factorization.

1051721453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684351.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 1051721453 is about 32430.2552102200. The cubic root of 1051721453 is about 1016.9515070499.

Adding to 1051721453 its reverse (3541271501), we get a palindrome (4592992954).

The spelling of 1051721453 in words is "one billion, fifty-one million, seven hundred twenty-one thousand, four hundred fifty-three".