133731225 has 36 divisors (see below), whose sum is σ = 241195500. Its totient is φ = 70826880.

The previous prime is 133731211. The next prime is 133731251. The reversal of 133731225 is 522137331.

It can be written as a sum of positive squares in 6 ways, for example, as 17867529 + 115863696 = 4227^2 + 10764^2 .

It is not a de Polignac number, because 133731225 - 2⁵ = 133731193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 31531 + ... + 35519.

It is an arithmetic number, because the mean of its divisors is an integer number (6699875).

Almost surely, 2^133731225 is an apocalyptic number.

133731225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133731225 is a deficient number, since it is larger than the sum of its proper divisors (107464275).

133731225 is a wasteful number, since it uses less digits than its factorization.

133731225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154 (or 4146 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 133731225 is about 11564.2217636986. The cubic root of 133731225 is about 511.3806304925.

Adding to 133731225 its reverse (522137331), we get a palindrome (655868556).

It can be divided in two parts, 133731 and 225, that added together give a square (133956 = 366²).

The spelling of 133731225 in words is "one hundred thirty-three million, seven hundred thirty-one thousand, two hundred twenty-five".