1790161921 has 6 divisors (see below), whose sum is σ = 1871379650. Its totient is φ = 1712328288.

The previous prime is 1790161903. The next prime is 1790161951. The reversal of 1790161921 is 1291610971.

It can be written as a sum of positive squares in only one way, i.e., 1342416321 + 447745600 = 36639^2 + 21160^2 .

It is not a de Polignac number, because 1790161921 - 2⁵ = 1790161889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1790161951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1691496 + ... + 1692553.

Almost surely, 2^1790161921 is an apocalyptic number.

It is an amenable number.

1790161921 is a deficient number, since it is larger than the sum of its proper divisors (81217729).

1790161921 is an equidigital number, since it uses as much as digits as its factorization.

1790161921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384095 (or 3384072 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 37.

The square root of 1790161921 is about 42310.3051395284. The cubic root of 1790161921 is about 1214.2201572141.

The spelling of 1790161921 in words is "one billion, seven hundred ninety million, one hundred sixty-one thousand, nine hundred twenty-one".