1625543261 has 2 divisors, whose sum is σ = 1625543262. Its totient is φ = 1625543260.

The previous prime is 1625543243. The next prime is 1625543267. The reversal of 1625543261 is 1623455261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625299225 + 244036 = 40315^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625543261 - 2¹⁸ = 1625281117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625543267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812771630 + 812771631.

It is an arithmetic number, because the mean of its divisors is an integer number (812771631).

Almost surely, 2^1625543261 is an apocalyptic number.

It is an amenable number.

1625543261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625543261 is an equidigital number, since it uses as much as digits as its factorization.

1625543261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 1625543261 is about 40318.0265018019. The cubic root of 1625543261 is about 1175.7983434614.

The spelling of 1625543261 in words is "one billion, six hundred twenty-five million, five hundred forty-three thousand, two hundred sixty-one".