1051720591 has 4 divisors (see below), whose sum is σ = 1057531384. Its totient is φ = 1045909800.

The previous prime is 1051720577. The next prime is 1051720603. The reversal of 1051720591 is 1950271501.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1051720591 is a prime.

It is a super-2 number, since 2×1051720591² = 2212232403066778562, 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 (1051720391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2905125 + ... + 2905486.

It is an arithmetic number, because the mean of its divisors is an integer number (264382846).

Almost surely, 2^1051720591 is an apocalyptic number.

1051720591 is a deficient number, since it is larger than the sum of its proper divisors (5810793).

1051720591 is an equidigital number, since it uses as much as digits as its factorization.

1051720591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810792.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 1051720591 is about 32430.2419201584. The cubic root of 1051720591 is about 1016.9512292158.

The spelling of 1051720591 in words is "one billion, fifty-one million, seven hundred twenty thousand, five hundred ninety-one".