1624681 has 2 divisors, whose sum is σ = 1624682. Its totient is φ = 1624680.

The previous prime is 1624663. The next prime is 1624687. The reversal of 1624681 is 1864261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 614656 = 1005^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1624681 - 2⁹ = 1624169 is a prime.

It is a super-2 number, since 2×1624681² = 5279176703522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1624687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812340 + 812341.

It is an arithmetic number, because the mean of its divisors is an integer number (812341).

2^1624681 is an apocalyptic number.

It is an amenable number.

1624681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1624681 is an equidigital number, since it uses as much as digits as its factorization.

1624681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 1624681 is about 1274.6297501628. The cubic root of 1624681 is about 117.5590407978.

The spelling of 1624681 in words is "one million, six hundred twenty-four thousand, six hundred eighty-one".