1901081 has 12 divisors (see below), whose sum is σ = 2354112. Its totient is φ = 1503216.

The previous prime is 1901033. The next prime is 1901087. The reversal of 1901081 is 1801091.

It is a de Polignac number, because none of the positive numbers 2^k-1901081 is a prime.

It is a super-2 number, since 2×1901081² = 7228217937122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380 + ... + 1986.

It is an arithmetic number, because the mean of its divisors is an integer number (196176).

2^1901081 is an apocalyptic number.

It is an amenable number.

1901081 is a deficient number, since it is larger than the sum of its proper divisors (453031).

1901081 is a wasteful number, since it uses less digits than its factorization.

1901081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1901081 is about 1378.7969393642. The cubic root of 1901081 is about 123.8797177356.

It can be divided in two parts, 19010 and 81, that added together give a palindrome (19091).

The spelling of 1901081 in words is "one million, nine hundred one thousand, eighty-one".