1171142731 has 4 divisors (see below), whose sum is σ = 1277610264. Its totient is φ = 1064675200.

The previous prime is 1171142717. The next prime is 1171142771. The reversal of 1171142731 is 1372411711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1171142731 - 2⁷ = 1171142603 is a prime.

It is a super-2 number, since 2×1171142731² = 2743150592748276722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1171142731.

It is not an unprimeable number, because it can be changed into a prime (1171142771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53233750 + ... + 53233771.

It is an arithmetic number, because the mean of its divisors is an integer number (319402566).

Almost surely, 2^1171142731 is an apocalyptic number.

1171142731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1171142731 is a deficient number, since it is larger than the sum of its proper divisors (106467533).

1171142731 is a wasteful number, since it uses less digits than its factorization.

1171142731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106467532.

The product of its digits is 1176, while the sum is 28.

The square root of 1171142731 is about 34221.9626994128. The cubic root of 1171142731 is about 1054.0711877932.

The spelling of 1171142731 in words is "one billion, one hundred seventy-one million, one hundred forty-two thousand, seven hundred thirty-one".