155240225 has 24 divisors (see below), whose sum is σ = 229568640. Its totient is φ = 101819520.

The previous prime is 155240213. The next prime is 155240251. The reversal of 155240225 is 522042551.

It is not a de Polignac number, because 155240225 - 2⁸ = 155239969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155240194 and 155240203.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15260 + ... + 23309.

It is an arithmetic number, because the mean of its divisors is an integer number (9565360).

Almost surely, 2^155240225 is an apocalyptic number.

It is an amenable number.

155240225 is a deficient number, since it is larger than the sum of its proper divisors (74328415).

155240225 is a wasteful number, since it uses less digits than its factorization.

155240225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38609 (or 38604 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 155240225 is about 12459.5435309645. The cubic root of 155240225 is about 537.4459004501.

Adding to 155240225 its reverse (522042551), we get a palindrome (677282776).

The spelling of 155240225 in words is "one hundred fifty-five million, two hundred forty thousand, two hundred twenty-five".