1172278881 has 24 divisors (see below), whose sum is σ = 1814679360. Its totient is φ = 727331616.

The previous prime is 1172278819. The next prime is 1172278883. The reversal of 1172278881 is 1888722711.

It is a happy number.

It is not a de Polignac number, because 1172278881 - 2⁹ = 1172278369 is a prime.

It is a super-2 number, since 2×1172278881² = 2748475549677224322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1172278883) 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 23 ways as a sum of consecutive naturals, for example, 68871 + ... + 84188.

It is an arithmetic number, because the mean of its divisors is an integer number (75611640).

Almost surely, 2^1172278881 is an apocalyptic number.

It is an amenable number.

1172278881 is a deficient number, since it is larger than the sum of its proper divisors (642400479).

1172278881 is a wasteful number, since it uses less digits than its factorization.

1172278881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153125 (or 153122 counting only the distinct ones).

The product of its digits is 100352, while the sum is 45.

The square root of 1172278881 is about 34238.5583954699. The cubic root of 1172278881 is about 1054.4119364456.

The spelling of 1172278881 in words is "one billion, one hundred seventy-two million, two hundred seventy-eight thousand, eight hundred eighty-one".