1543961 has 2 divisors, whose sum is σ = 1543962. Its totient is φ = 1543960.

The previous prime is 1543951. The next prime is 1543979. The reversal of 1543961 is 1693451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 235225 = 1144^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543961 - 2¹⁴ = 1527577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1543951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771980 + 771981.

It is an arithmetic number, because the mean of its divisors is an integer number (771981).

2^1543961 is an apocalyptic number.

It is an amenable number.

1543961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543961 is an equidigital number, since it uses as much as digits as its factorization.

1543961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1543961 is about 1242.5622720814. The cubic root of 1543961 is about 115.5789581478.

The spelling of 1543961 in words is "one million, five hundred forty-three thousand, nine hundred sixty-one".