1090695557 has 12 divisors (see below), whose sum is σ = 1269329580. Its totient is φ = 934468416.

The previous prime is 1090695553. The next prime is 1090695569. The reversal of 1090695557 is 7555960901.

It can be written as a sum of positive squares in 2 ways, for example, as 958583521 + 132112036 = 30961^2 + 11494^2 .

It is not a de Polignac number, because 1090695557 - 2² = 1090695553 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 (1090695553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169169 + ... + 175497.

It is an arithmetic number, because the mean of its divisors is an integer number (105777465).

Almost surely, 2^1090695557 is an apocalyptic number.

It is an amenable number.

1090695557 is a deficient number, since it is larger than the sum of its proper divisors (178634023).

1090695557 is an equidigital number, since it uses as much as digits as its factorization.

1090695557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9860 (or 9853 counting only the distinct ones).

The product of its (nonzero) digits is 425250, while the sum is 47.

The square root of 1090695557 is about 33025.6802655146. The cubic root of 1090695557 is about 1029.3613274394.

The spelling of 1090695557 in words is "one billion, ninety million, six hundred ninety-five thousand, five hundred fifty-seven".