1117857621 has 8 divisors (see below), whose sum is σ = 1495782144. Its totient is φ = 742585760.

The previous prime is 1117857607. The next prime is 1117857659. The reversal of 1117857621 is 1267587111.

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 1117857621 - 2⁷ = 1117857493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1117857621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117850621) 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 7 ways as a sum of consecutive naturals, for example, 662181 + ... + 663866.

It is an arithmetic number, because the mean of its divisors is an integer number (186972768).

Almost surely, 2^1117857621 is an apocalyptic number.

It is an amenable number.

1117857621 is a deficient number, since it is larger than the sum of its proper divisors (377924523).

1117857621 is a wasteful number, since it uses less digits than its factorization.

1117857621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326331.

The product of its digits is 23520, while the sum is 39.

The square root of 1117857621 is about 33434.3778318066. The cubic root of 1117857621 is about 1037.8362375810.

The spelling of 1117857621 in words is "one billion, one hundred seventeen million, eight hundred fifty-seven thousand, six hundred twenty-one".