1171375681 has 4 divisors (see below), whose sum is σ = 1338715072. Its totient is φ = 1004036292.

The previous prime is 1171375663. The next prime is 1171375691. The reversal of 1171375681 is 1865731711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1865731711 = 1693 ⋅1102027.

It is not a de Polignac number, because 1171375681 - 2¹⁹ = 1170851393 is a prime.

It is a super-2 number, since 2×1171375681² = 2744241972076427522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171375691) 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 in 3 ways as a sum of consecutive naturals, for example, 83669685 + ... + 83669698.

It is an arithmetic number, because the mean of its divisors is an integer number (334678768).

Almost surely, 2^1171375681 is an apocalyptic number.

It is an amenable number.

1171375681 is a deficient number, since it is larger than the sum of its proper divisors (167339391).

1171375681 is an equidigital number, since it uses as much as digits as its factorization.

1171375681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167339390.

The product of its digits is 35280, while the sum is 40.

The square root of 1171375681 is about 34225.3660462529. The cubic root of 1171375681 is about 1054.1410709931.

The spelling of 1171375681 in words is "one billion, one hundred seventy-one million, three hundred seventy-five thousand, six hundred eighty-one".