1171125805 has 12 divisors (see below), whose sum is σ = 1419464916. Its totient is φ = 927584000.

The previous prime is 1171125779. The next prime is 1171125817. The reversal of 1171125805 is 5085211711.

It can be written as a sum of positive squares in 6 ways, for example, as 387853636 + 783272169 = 19694^2 + 27987^2 .

It is not a de Polignac number, because 1171125805 - 2⁵ = 1171125773 is a prime.

It is a super-2 number, since 2×1171125805² = 2743071302273796050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39525 + ... + 62485.

It is an arithmetic number, because the mean of its divisors is an integer number (118288743).

Almost surely, 2^1171125805 is an apocalyptic number.

It is an amenable number.

1171125805 is a deficient number, since it is larger than the sum of its proper divisors (248339111).

1171125805 is an equidigital number, since it uses as much as digits as its factorization.

1171125805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23168 (or 23067 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 31.

The square root of 1171125805 is about 34221.7154011893. The cubic root of 1171125805 is about 1054.0661097629.

The spelling of 1171125805 in words is "one billion, one hundred seventy-one million, one hundred twenty-five thousand, eight hundred five".