1625265221 has 4 divisors (see below), whose sum is σ = 1625594700. Its totient is φ = 1624935744.

The previous prime is 1625265157. The next prime is 1625265283. The reversal of 1625265221 is 1225625261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1225625261 = 7 ⋅175089323.

It can be written as a sum of positive squares in 2 ways, for example, as 875272225 + 749992996 = 29585^2 + 27386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625265221 - 2⁶ = 1625265157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625265121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157226 + ... + 167243.

It is an arithmetic number, because the mean of its divisors is an integer number (406398675).

Almost surely, 2^1625265221 is an apocalyptic number.

It is an amenable number.

1625265221 is a deficient number, since it is larger than the sum of its proper divisors (329479).

1625265221 is an equidigital number, since it uses as much as digits as its factorization.

1625265221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329478.

The product of its digits is 14400, while the sum is 32.

The square root of 1625265221 is about 40314.5782689091. The cubic root of 1625265221 is about 1175.7313017488.

The spelling of 1625265221 in words is "one billion, six hundred twenty-five million, two hundred sixty-five thousand, two hundred twenty-one".