1626281 has 2 divisors, whose sum is σ = 1626282. Its totient is φ = 1626280.

The previous prime is 1626277. The next prime is 1626283. The reversal of 1626281 is 1826261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 502681 = 1060^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626281 - 2² = 1626277 is a prime.

It is a super-2 number, since 2×1626281² = 5289579781922, which contains 22 as substring.

Together with 1626283, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₂₂₉₈₄ and since 1626281 and 122984 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 1626281.

It is not a weakly prime, because it can be changed into another prime (1626283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813140 + 813141.

It is an arithmetic number, because the mean of its divisors is an integer number (813141).

2^1626281 is an apocalyptic number.

It is an amenable number.

1626281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626281 is an equidigital number, since it uses as much as digits as its factorization.

1626281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 1626281 is about 1275.2572289542. The cubic root of 1626281 is about 117.5976191922.

The spelling of 1626281 in words is "one million, six hundred twenty-six thousand, two hundred eighty-one".