1091957 has 2 divisors, whose sum is σ = 1091958. Its totient is φ = 1091956.

The previous prime is 1091939. The next prime is 1091983. The reversal of 1091957 is 7591901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 22801 = 1034^2 + 151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091957 - 2¹² = 1087861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545978 + 545979.

It is an arithmetic number, because the mean of its divisors is an integer number (545979).

2^1091957 is an apocalyptic number.

It is an amenable number.

1091957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091957 is an equidigital number, since it uses as much as digits as its factorization.

1091957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 1091957 is about 1044.9674636083. The cubic root of 1091957 is about 102.9758010201.

It can be divided in two parts, 1091 and 957, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1091957 in words is "one million, ninety-one thousand, nine hundred fifty-seven".