1264561 has 2 divisors, whose sum is σ = 1264562. Its totient is φ = 1264560.

The previous prime is 1264559. The next prime is 1264573. The reversal of 1264561 is 1654621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 65536 = 1095^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264561 - 2¹ = 1264559 is a prime.

It is a super-2 number, since 2×1264561² = 3198229045442, which contains 22 as substring.

Together with 1264559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1264541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632280 + 632281.

It is an arithmetic number, because the mean of its divisors is an integer number (632281).

2^1264561 is an apocalyptic number.

It is an amenable number.

1264561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264561 is an equidigital number, since it uses as much as digits as its factorization.

1264561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 1264561 is about 1124.5270116809. The cubic root of 1264561 is about 108.1383971059.

The spelling of 1264561 in words is "one million, two hundred sixty-four thousand, five hundred sixty-one".