1171212478 has 32 divisors (see below), whose sum is σ = 1898900640. Its totient is φ = 539965440.

The previous prime is 1171212439. The next prime is 1171212491. The reversal of 1171212478 is 8742121711.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1047976 + ... + 1049092.

It is an arithmetic number, because the mean of its divisors is an integer number (59340645).

Almost surely, 2^1171212478 is an apocalyptic number.

1171212478 is a deficient number, since it is larger than the sum of its proper divisors (727688162).

1171212478 is a wasteful number, since it uses less digits than its factorization.

1171212478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its digits is 6272, while the sum is 34.

The square root of 1171212478 is about 34222.9817228131. The cubic root of 1171212478 is about 1054.0921123261.

The spelling of 1171212478 in words is "one billion, one hundred seventy-one million, two hundred twelve thousand, four hundred seventy-eight".