1625216449 has 2 divisors, whose sum is σ = 1625216450. Its totient is φ = 1625216448.

The previous prime is 1625216423. The next prime is 1625216479. The reversal of 1625216449 is 9446125261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929945025 + 695271424 = 30495^2 + 26368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625216449 - 2¹³ = 1625208257 is a prime.

It is a super-2 number, since 2×1625216449² = 5282657012200339202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1625216479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812608224 + 812608225.

It is an arithmetic number, because the mean of its divisors is an integer number (812608225).

Almost surely, 2^1625216449 is an apocalyptic number.

It is an amenable number.

1625216449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625216449 is an equidigital number, since it uses as much as digits as its factorization.

1625216449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 1625216449 is about 40313.9733715247. The cubic root of 1625216449 is about 1175.7195409318.

The spelling of 1625216449 in words is "one billion, six hundred twenty-five million, two hundred sixteen thousand, four hundred forty-nine".