920197813 has 4 divisors (see below), whose sum is σ = 923696928. Its totient is φ = 916698700.

The previous prime is 920197801. The next prime is 920197829. The reversal of 920197813 is 318791029.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318791029 = 6823 ⋅46723.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920197813 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 (920197853) 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 3 ways as a sum of consecutive naturals, for example, 1749163 + ... + 1749688.

It is an arithmetic number, because the mean of its divisors is an integer number (230924232).

Almost surely, 2^920197813 is an apocalyptic number.

It is an amenable number.

920197813 is a deficient number, since it is larger than the sum of its proper divisors (3499115).

920197813 is a wasteful number, since it uses less digits than its factorization.

920197813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499114.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 920197813 is about 30334.7624516824. The cubic root of 920197813 is about 972.6585280037.

The spelling of 920197813 in words is "nine hundred twenty million, one hundred ninety-seven thousand, eight hundred thirteen".