991059457 has 2 divisors, whose sum is σ = 991059458. Its totient is φ = 991059456.

The previous prime is 991059449. The next prime is 991059473. The reversal of 991059457 is 754950199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 946423696 + 44635761 = 30764^2 + 6681^2 .

It is a cyclic number.

It is not a de Polignac number, because 991059457 - 2³ = 991059449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991059457.

It is not a weakly prime, because it can be changed into another prime (991050457) 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, 495529728 + 495529729.

It is an arithmetic number, because the mean of its divisors is an integer number (495529729).

Almost surely, 2^991059457 is an apocalyptic number.

It is an amenable number.

991059457 is a deficient number, since it is larger than the sum of its proper divisors (1).

991059457 is an equidigital number, since it uses as much as digits as its factorization.

991059457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 991059457 is about 31481.0968201554. The cubic root of 991059457 is about 997.0108931425.

The spelling of 991059457 in words is "nine hundred ninety-one million, fifty-nine thousand, four hundred fifty-seven".