1051891549 has 2 divisors, whose sum is σ = 1051891550. Its totient is φ = 1051891548.

The previous prime is 1051891487. The next prime is 1051891559. The reversal of 1051891549 is 9451981501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 951290649 + 100600900 = 30843^2 + 10030^2 .

It is an emirp because it is prime and its reverse (9451981501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1051891549 - 2¹⁷ = 1051760477 is a prime.

It is a super-2 number, since 2×1051891549² = 2212951661715238802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051891559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525945774 + 525945775.

It is an arithmetic number, because the mean of its divisors is an integer number (525945775).

Almost surely, 2^1051891549 is an apocalyptic number.

It is an amenable number.

1051891549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051891549 is an equidigital number, since it uses as much as digits as its factorization.

1051891549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 43.

The square root of 1051891549 is about 32432.8775935778. The cubic root of 1051891549 is about 1017.0063283015.

The spelling of 1051891549 in words is "one billion, fifty-one million, eight hundred ninety-one thousand, five hundred forty-nine".