1171945421 has 8 divisors (see below), whose sum is σ = 1210351104. Its totient is φ = 1133577360.

The previous prime is 1171945417. The next prime is 1171945429. The reversal of 1171945421 is 1245491711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1171945421 - 2² = 1171945417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171945429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62840 + ... + 79326.

It is an arithmetic number, because the mean of its divisors is an integer number (151293888).

Almost surely, 2^1171945421 is an apocalyptic number.

It is an amenable number.

1171945421 is a deficient number, since it is larger than the sum of its proper divisors (38405683).

1171945421 is a wasteful number, since it uses less digits than its factorization.

1171945421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18811.

The product of its digits is 10080, while the sum is 35.

The square root of 1171945421 is about 34233.6883931603. The cubic root of 1171945421 is about 1054.3119495586.

The spelling of 1171945421 in words is "one billion, one hundred seventy-one million, nine hundred forty-five thousand, four hundred twenty-one".