155321025 has 12 divisors (see below), whose sum is σ = 256797552. Its totient is φ = 82837840.

The previous prime is 155320999. The next prime is 155321039. The reversal of 155321025 is 520123551.

It is a happy number.

It is not a de Polignac number, because 155321025 - 2⁶ = 155320961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155320986 and 155321004.

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, 1035399 + ... + 1035548.

It is an arithmetic number, because the mean of its divisors is an integer number (21399796).

Almost surely, 2^155321025 is an apocalyptic number.

155321025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155321025 is a deficient number, since it is larger than the sum of its proper divisors (101476527).

155321025 is a wasteful number, since it uses less digits than its factorization.

155321025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070960 (or 2070955 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155321025 is about 12462.7856035479. The cubic root of 155321025 is about 537.5391282134.

Adding to 155321025 its reverse (520123551), we get a palindrome (675444576).

It can be divided in two parts, 1553 and 21025, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 155321025 in words is "one hundred fifty-five million, three hundred twenty-one thousand, twenty-five".