1091258557 has 2 divisors, whose sum is σ = 1091258558. Its totient is φ = 1091258556.

The previous prime is 1091258507. The next prime is 1091258563. The reversal of 1091258557 is 7558521901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706549561 + 384708996 = 26581^2 + 19614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091258557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091258507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545629278 + 545629279.

It is an arithmetic number, because the mean of its divisors is an integer number (545629279).

Almost surely, 2^1091258557 is an apocalyptic number.

It is an amenable number.

1091258557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091258557 is an equidigital number, since it uses as much as digits as its factorization.

1091258557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 43.

The square root of 1091258557 is about 33034.2028358488. The cubic root of 1091258557 is about 1029.5384103835.

The spelling of 1091258557 in words is "one billion, ninety-one million, two hundred fifty-eight thousand, five hundred fifty-seven".