920861509 has 8 divisors (see below), whose sum is σ = 930488832. Its totient is φ = 911247600.

The previous prime is 920861507. The next prime is 920861537. The reversal of 920861509 is 905168029.

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 920861509 - 2¹ = 920861507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920861507) 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 7 ways as a sum of consecutive naturals, for example, 193452 + ... + 198154.

It is an arithmetic number, because the mean of its divisors is an integer number (116311104).

Almost surely, 2^920861509 is an apocalyptic number.

It is an amenable number.

920861509 is a deficient number, since it is larger than the sum of its proper divisors (9627323).

920861509 is a wasteful number, since it uses less digits than its factorization.

920861509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 920861509 is about 30345.7000084032. The cubic root of 920861509 is about 972.8923162993.

The spelling of 920861509 in words is "nine hundred twenty million, eight hundred sixty-one thousand, five hundred nine".