920491909131 has 4 divisors (see below), whose sum is σ = 1227322545512. Its totient is φ = 613661272752.

The previous prime is 920491909091. The next prime is 920491909133. The reversal of 920491909131 is 131909194029.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 920491909131 - 2³³ = 911901974539 is a prime.

It is a super-2 number, since 2×920491909131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920491909133) 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 3 ways as a sum of consecutive naturals, for example, 153415318186 + ... + 153415318191.

It is an arithmetic number, because the mean of its divisors is an integer number (306830636378).

Almost surely, 2^920491909131 is an apocalyptic number.

920491909131 is a deficient number, since it is larger than the sum of its proper divisors (306830636381).

920491909131 is a wasteful number, since it uses less digits than its factorization.

920491909131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306830636380.

The product of its (nonzero) digits is 157464, while the sum is 48.

The spelling of 920491909131 in words is "nine hundred twenty billion, four hundred ninety-one million, nine hundred nine thousand, one hundred thirty-one".