920721473 has 4 divisors (see below), whose sum is σ = 1052253120. Its totient is φ = 789189828.

The previous prime is 920721467. The next prime is 920721481. The reversal of 920721473 is 374127029.

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.

It is a de Polignac number, because none of the positive numbers 2^k-920721473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920721413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65765813 + ... + 65765826.

It is an arithmetic number, because the mean of its divisors is an integer number (263063280).

Almost surely, 2^920721473 is an apocalyptic number.

It is an amenable number.

920721473 is a deficient number, since it is larger than the sum of its proper divisors (131531647).

920721473 is a wasteful number, since it uses less digits than its factorization.

920721473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131531646.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 920721473 is about 30343.3925756498. The cubic root of 920721473 is about 972.8429976798.

The spelling of 920721473 in words is "nine hundred twenty million, seven hundred twenty-one thousand, four hundred seventy-three".