1566251 has 2 divisors, whose sum is σ = 1566252. Its totient is φ = 1566250.

The previous prime is 1566239. The next prime is 1566263. The reversal of 1566251 is 1526651.

It is a balanced prime because it is at equal distance from previous prime (1566239) and next prime (1566263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1566251 is a prime.

It is equal to p₁₁₈₈₀₈ and since 1566251 and 118808 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1566251.

It is not a weakly prime, because it can be changed into another prime (1566211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783125 + 783126.

It is an arithmetic number, because the mean of its divisors is an integer number (783126).

2^1566251 is an apocalyptic number.

1566251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566251 is an equidigital number, since it uses as much as digits as its factorization.

1566251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1566251 is about 1251.4995005992. The cubic root of 1566251 is about 116.1325031660.

It can be divided in two parts, 15 and 66251, that added together give a palindrome (66266).

The spelling of 1566251 in words is "one million, five hundred sixty-six thousand, two hundred fifty-one".