1625404427 has 2 divisors, whose sum is σ = 1625404428. Its totient is φ = 1625404426.

The previous prime is 1625404283. The next prime is 1625404447. The reversal of 1625404427 is 7244045261.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7244045261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1625404427 - 2²⁰ = 1624355851 is a prime.

It is a super-2 number, since 2×1625404427² = 5283879102622396658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1625404447) 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, 812702213 + 812702214.

It is an arithmetic number, because the mean of its divisors is an integer number (812702214).

Almost surely, 2^1625404427 is an apocalyptic number.

1625404427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625404427 is an equidigital number, since it uses as much as digits as its factorization.

1625404427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 1625404427 is about 40316.3047289803. The cubic root of 1625404427 is about 1175.7648684096.

Adding to 1625404427 its reverse (7244045261), we get a palindrome (8869449688).

The spelling of 1625404427 in words is "one billion, six hundred twenty-five million, four hundred four thousand, four hundred twenty-seven".