1491054081 has 40 divisors (see below), whose sum is σ = 2218624800. Its totient is φ = 890598720.

The previous prime is 1491054079. The next prime is 1491054091. The reversal of 1491054081 is 1804501941.

1491054081 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1491054081 - 2¹ = 1491054079 is a prime.

It is a super-2 number, since 2×1491054081² = 4446484544933509122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1491054091) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3645405 + ... + 3645813.

It is an arithmetic number, because the mean of its divisors is an integer number (55465620).

Almost surely, 2^1491054081 is an apocalyptic number.

1491054081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1491054081 is a deficient number, since it is larger than the sum of its proper divisors (727570719).

1491054081 is an frugal number, since it uses more digits than its factorization.

1491054081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1491054081 is about 38614.1694329944. The cubic root of 1491054081 is about 1142.4340322012.

The spelling of 1491054081 in words is "one billion, four hundred ninety-one million, fifty-four thousand, eighty-one".