1051720543 has 4 divisors (see below), whose sum is σ = 1053088960. Its totient is φ = 1050352128.

The previous prime is 1051720529. The next prime is 1051720567. The reversal of 1051720543 is 3450271501.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1051720543 - 2²¹ = 1049623391 is a prime.

It is a super-2 number, since 2×1051720543² = 2212232201136429698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051720513) 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, 683055 + ... + 684592.

It is an arithmetic number, because the mean of its divisors is an integer number (263272240).

Almost surely, 2^1051720543 is an apocalyptic number.

1051720543 is a deficient number, since it is larger than the sum of its proper divisors (1368417).

1051720543 is an equidigital number, since it uses as much as digits as its factorization.

1051720543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368416.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1051720543 is about 32430.2411801084. The cubic root of 1051720543 is about 1016.9512137447.

The spelling of 1051720543 in words is "one billion, fifty-one million, seven hundred twenty thousand, five hundred forty-three".