1091040757 has 4 divisors (see below), whose sum is σ = 1091170476. Its totient is φ = 1090911040.

The previous prime is 1091040749. The next prime is 1091040761. The reversal of 1091040757 is 7570401901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7570401901 = 10667 ⋅709703.

It can be written as a sum of positive squares in 2 ways, for example, as 1072300516 + 18740241 = 32746^2 + 4329^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091040757 - 2³ = 1091040749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091040557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51298 + ... + 69379.

It is an arithmetic number, because the mean of its divisors is an integer number (272792619).

Almost surely, 2^1091040757 is an apocalyptic number.

It is an amenable number.

1091040757 is a deficient number, since it is larger than the sum of its proper divisors (129719).

1091040757 is an equidigital number, since it uses as much as digits as its factorization.

1091040757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129718.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1091040757 is about 33030.9060880867. The cubic root of 1091040757 is about 1029.4699119866.

The spelling of 1091040757 in words is "one billion, ninety-one million, forty thousand, seven hundred fifty-seven".