225121545 has 32 divisors (see below), whose sum is σ = 436602240. Its totient is φ = 109149120.

The previous prime is 225121499. The next prime is 225121549. The reversal of 225121545 is 545121522.

It is not a de Polignac number, because 225121545 - 2¹³ = 225113353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (225121549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74314 + ... + 77283.

It is an arithmetic number, because the mean of its divisors is an integer number (13643820).

Almost surely, 2^225121545 is an apocalyptic number.

It is an amenable number.

225121545 is a deficient number, since it is larger than the sum of its proper divisors (211480695).

225121545 is a wasteful number, since it uses less digits than its factorization.

225121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151622 (or 151616 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 225121545 is about 15004.0509529927. The cubic root of 225121545 is about 608.3297000263.

The spelling of 225121545 in words is "two hundred twenty-five million, one hundred twenty-one thousand, five hundred forty-five".