155431425 has 72 divisors (see below), whose sum is σ = 279571392. Its totient is φ = 76160000.

The previous prime is 155431417. The next prime is 155431439. The reversal of 155431425 is 524134551.

It is not a de Polignac number, because 155431425 - 2³ = 155431417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155431392 and 155431401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1538875 + ... + 1538975.

It is an arithmetic number, because the mean of its divisors is an integer number (3882936).

Almost surely, 2^155431425 is an apocalyptic number.

155431425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155431425 is a deficient number, since it is larger than the sum of its proper divisors (124139967).

155431425 is a wasteful number, since it uses less digits than its factorization.

155431425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 197 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 155431425 is about 12467.2140031364. The cubic root of 155431425 is about 537.6664564677. Note that the first 3 decimals are identical.

Adding to 155431425 its reverse (524134551), we get a palindrome (679565976).

The spelling of 155431425 in words is "one hundred fifty-five million, four hundred thirty-one thousand, four hundred twenty-five".