155091225 has 12 divisors (see below), whose sum is σ = 256417616. Its totient is φ = 82715280.

The previous prime is 155091203. The next prime is 155091241. The reversal of 155091225 is 522190551.

It is not a de Polignac number, because 155091225 - 2¹¹ = 155089177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155091192 and 155091201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1033867 + ... + 1034016.

Almost surely, 2^155091225 is an apocalyptic number.

155091225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155091225 is a deficient number, since it is larger than the sum of its proper divisors (101326391).

155091225 is a wasteful number, since it uses less digits than its factorization.

155091225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067896 (or 2067891 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 155091225 is about 12453.5627432474. The cubic root of 155091225 is about 537.2738980519.

The spelling of 155091225 in words is "one hundred fifty-five million, ninety-one thousand, two hundred twenty-five".