1491020379 has 20 divisors (see below), whose sum is σ = 2324169936. Its totient is φ = 950794416.

The previous prime is 1491020359. The next prime is 1491020393. The reversal of 1491020379 is 9730201941.

It is not a de Polignac number, because 1491020379 - 2⁵ = 1491020347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491020359) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 398304 + ... + 402029.

Almost surely, 2^1491020379 is an apocalyptic number.

1491020379 is a deficient number, since it is larger than the sum of its proper divisors (833149557).

1491020379 is an equidigital number, since it uses as much as digits as its factorization.

1491020379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800368 (or 800359 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1491020379 is about 38613.7330363175. The cubic root of 1491020379 is about 1142.4254247330.

The spelling of 1491020379 in words is "one billion, four hundred ninety-one million, twenty thousand, three hundred seventy-nine".