1625016901 has 2 divisors, whose sum is σ = 1625016902. Its totient is φ = 1625016900.

The previous prime is 1625016871. The next prime is 1625016937. The reversal of 1625016901 is 1096105261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207632001 + 417384900 = 34751^2 + 20430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625016901 - 2⁹ = 1625016389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625016101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812508450 + 812508451.

It is an arithmetic number, because the mean of its divisors is an integer number (812508451).

Almost surely, 2^1625016901 is an apocalyptic number.

It is an amenable number.

1625016901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625016901 is an equidigital number, since it uses as much as digits as its factorization.

1625016901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 1625016901 is about 40311.4983720526. The cubic root of 1625016901 is about 1175.6714197342.

The spelling of 1625016901 in words is "one billion, six hundred twenty-five million, sixteen thousand, nine hundred one".