1625455221 has 16 divisors (see below), whose sum is σ = 2471281344. Its totient is φ = 941439744.

The previous prime is 1625455211. The next prime is 1625455231. The reversal of 1625455221 is 1225545261.

It is an interprime number because it is at equal distance from previous prime (1625455211) and next prime (1625455231).

It is not a de Polignac number, because 1625455221 - 2⁹ = 1625454709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625455211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225171 + ... + 1226496.

It is an arithmetic number, because the mean of its divisors is an integer number (154455084).

Almost surely, 2^1625455221 is an apocalyptic number.

It is an amenable number.

1625455221 is a deficient number, since it is larger than the sum of its proper divisors (845826123).

1625455221 is a wasteful number, since it uses less digits than its factorization.

1625455221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451700.

The product of its digits is 24000, while the sum is 33.

The square root of 1625455221 is about 40316.9346677051. The cubic root of 1625455221 is about 1175.7771158597. Note that the first 3 decimals are identical.

The spelling of 1625455221 in words is "one billion, six hundred twenty-five million, four hundred fifty-five thousand, two hundred twenty-one".