1630793721 has 4 divisors (see below), whose sum is σ = 2174391632. Its totient is φ = 1087195812.

The previous prime is 1630793699. The next prime is 1630793789. The reversal of 1630793721 is 1273970361.

It is a happy number.

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 not a de Polignac number, because 1630793721 - 2¹⁰ = 1630792697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1630793721.

It is not an unprimeable number, because it can be changed into a prime (1630793621) 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, 271798951 + ... + 271798956.

It is an arithmetic number, because the mean of its divisors is an integer number (543597908).

Almost surely, 2^1630793721 is an apocalyptic number.

It is an amenable number.

1630793721 is a deficient number, since it is larger than the sum of its proper divisors (543597911).

1630793721 is an equidigital number, since it uses as much as digits as its factorization.

1630793721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543597910.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 1630793721 is about 40383.0870662459. The cubic root of 1630793721 is about 1177.0629150243.

The spelling of 1630793721 in words is "one billion, six hundred thirty million, seven hundred ninety-three thousand, seven hundred twenty-one".