225138949 has 4 divisors (see below), whose sum is σ = 257301664. Its totient is φ = 192976236.

The previous prime is 225138943. The next prime is 225138967. The reversal of 225138949 is 949831522.

225138949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225138949 - 2⁵ = 225138917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225138943) 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, 16081347 + ... + 16081360.

It is an arithmetic number, because the mean of its divisors is an integer number (64325416).

Almost surely, 2^225138949 is an apocalyptic number.

It is an amenable number.

225138949 is a deficient number, since it is larger than the sum of its proper divisors (32162715).

225138949 is an equidigital number, since it uses as much as digits as its factorization.

225138949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32162714.

The product of its digits is 155520, while the sum is 43.

The square root of 225138949 is about 15004.6309184865. The cubic root of 225138949 is about 608.3453761466.

The spelling of 225138949 in words is "two hundred twenty-five million, one hundred thirty-eight thousand, nine hundred forty-nine".