2401561 has 2 divisors, whose sum is σ = 2401562. Its totient is φ = 2401560.

The previous prime is 2401549. The next prime is 2401571. The reversal of 2401561 is 1651042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2343961 + 57600 = 1531^2 + 240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2401561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2401501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200780 + 1200781.

It is an arithmetic number, because the mean of its divisors is an integer number (1200781).

2^2401561 is an apocalyptic number.

It is an amenable number.

2401561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2401561 is an equidigital number, since it uses as much as digits as its factorization.

2401561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2401561 is about 1549.6970671715. The cubic root of 2401561 is about 133.9156110819.

The spelling of 2401561 in words is "two million, four hundred one thousand, five hundred sixty-one".