1541981 has 6 divisors (see below), whose sum is σ = 1793790. Its totient is φ = 1321656.

The previous prime is 1541963. The next prime is 1541987. The reversal of 1541981 is 1891451.

It can be written as a sum of positive squares in only one way, i.e., 1301881 + 240100 = 1141^2 + 490^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1541981 is a prime.

It is a super-2 number, since 2×1541981² = 4755410808722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1541987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15686 + ... + 15783.

It is an arithmetic number, because the mean of its divisors is an integer number (298965).

2^1541981 is an apocalyptic number.

It is an amenable number.

1541981 is a deficient number, since it is larger than the sum of its proper divisors (251809).

1541981 is an equidigital number, since it uses as much as digits as its factorization.

1541981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31483 (or 31476 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 1541981 is about 1241.7652757265. The cubic root of 1541981 is about 115.5295302515.

The spelling of 1541981 in words is "one million, five hundred forty-one thousand, nine hundred eighty-one".