1541681 has 2 divisors, whose sum is σ = 1541682. Its totient is φ = 1541680.

The previous prime is 1541671. The next prime is 1541689. The reversal of 1541681 is 1861451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1540081 + 1600 = 1241^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 1541681 - 2¹⁴ = 1525297 is a prime.

It is a super-2 number, since 2×1541681² = 4753560611522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1541681.

It is not a weakly prime, because it can be changed into another prime (1541689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770840 + 770841.

It is an arithmetic number, because the mean of its divisors is an integer number (770841).

2^1541681 is an apocalyptic number.

It is an amenable number.

1541681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1541681 is an equidigital number, since it uses as much as digits as its factorization.

1541681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 1541681 is about 1241.6444740746. The cubic root of 1541681 is about 115.5220374858.

It can be divided in two parts, 1541 and 681, that added together give a palindrome (2222).

The spelling of 1541681 in words is "one million, five hundred forty-one thousand, six hundred eighty-one".