1625346521 has 2 divisors, whose sum is σ = 1625346522. Its totient is φ = 1625346520.

The previous prime is 1625346509. The next prime is 1625346539. The reversal of 1625346521 is 1256435261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900660121 + 724686400 = 30011^2 + 26920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625346521 - 2¹⁰ = 1625345497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625346571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812673260 + 812673261.

It is an arithmetic number, because the mean of its divisors is an integer number (812673261).

Almost surely, 2^1625346521 is an apocalyptic number.

It is an amenable number.

1625346521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625346521 is an equidigital number, since it uses as much as digits as its factorization.

1625346521 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 1625346521 is about 40315.5865764099. The cubic root of 1625346521 is about 1175.7509058028.

The spelling of 1625346521 in words is "one billion, six hundred twenty-five million, three hundred forty-six thousand, five hundred twenty-one".