1301561 has 2 divisors, whose sum is σ = 1301562. Its totient is φ = 1301560.

The previous prime is 1301551. The next prime is 1301581. The reversal of 1301561 is 1651031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 219961 = 1040^2 + 469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301561 - 2⁶ = 1301497 is a prime.

It is a super-2 number, since 2×1301561² = 3388122073442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1301551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650780 + 650781.

It is an arithmetic number, because the mean of its divisors is an integer number (650781).

2^1301561 is an apocalyptic number.

It is an amenable number.

1301561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301561 is an equidigital number, since it uses as much as digits as its factorization.

1301561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1301561 is about 1140.8597635117. The cubic root of 1301561 is about 109.1829545328.

Adding to 1301561 its reverse (1651031), we get a palindrome (2952592).

The spelling of 1301561 in words is "one million, three hundred one thousand, five hundred sixty-one".