919069721 has 4 divisors (see below), whose sum is σ = 927992832. Its totient is φ = 910146612.

The previous prime is 919069703. The next prime is 919069777. The reversal of 919069721 is 127960919.

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 cyclic number.

It is not a de Polignac number, because 919069721 - 2¹⁰ = 919068697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919069321) 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, 4461401 + ... + 4461606.

It is an arithmetic number, because the mean of its divisors is an integer number (231998208).

Almost surely, 2^919069721 is an apocalyptic number.

It is an amenable number.

919069721 is a deficient number, since it is larger than the sum of its proper divisors (8923111).

919069721 is a wasteful number, since it uses less digits than its factorization.

919069721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923110.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 919069721 is about 30316.1627024266. The cubic root of 919069721 is about 972.2608971990.

The spelling of 919069721 in words is "nine hundred nineteen million, sixty-nine thousand, seven hundred twenty-one".