1625420191 has 2 divisors, whose sum is σ = 1625420192. Its totient is φ = 1625420190.

The previous prime is 1625420177. The next prime is 1625420239. The reversal of 1625420191 is 1910245261.

It is a weak prime.

It is an emirp because it is prime and its reverse (1910245261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625420191 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625420161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812710095 + 812710096.

It is an arithmetic number, because the mean of its divisors is an integer number (812710096).

Almost surely, 2^1625420191 is an apocalyptic number.

1625420191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625420191 is an equidigital number, since it uses as much as digits as its factorization.

1625420191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1625420191 is about 40316.5002325351. The cubic root of 1625420191 is about 1175.7686694528.

The spelling of 1625420191 in words is "one billion, six hundred twenty-five million, four hundred twenty thousand, one hundred ninety-one".