1625402879 has 2 divisors, whose sum is σ = 1625402880. Its totient is φ = 1625402878.

The previous prime is 1625402873. The next prime is 1625402917. The reversal of 1625402879 is 9782045261.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1625402879 - 2¹² = 1625398783 is a prime.

It is a super-2 number, since 2×1625402879² = 5283869038122977282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625402873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812701439 + 812701440.

It is an arithmetic number, because the mean of its divisors is an integer number (812701440).

Almost surely, 2^1625402879 is an apocalyptic number.

1625402879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625402879 is an equidigital number, since it uses as much as digits as its factorization.

1625402879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1625402879 is about 40316.2855307877. The cubic root of 1625402879 is about 1175.7644951518.

The spelling of 1625402879 in words is "one billion, six hundred twenty-five million, four hundred two thousand, eight hundred seventy-nine".