155148009 has 4 divisors (see below), whose sum is σ = 206864016. Its totient is φ = 103432004.

The previous prime is 155147989. The next prime is 155148011. The reversal of 155148009 is 900841551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900841551 = 3 ⋅300280517.

It is a cyclic number.

It is not a de Polignac number, because 155148009 - 2⁹ = 155147497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155148029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25857999 + ... + 25858004.

It is an arithmetic number, because the mean of its divisors is an integer number (51716004).

Almost surely, 2^155148009 is an apocalyptic number.

It is an amenable number.

155148009 is a deficient number, since it is larger than the sum of its proper divisors (51716007).

155148009 is an equidigital number, since it uses as much as digits as its factorization.

155148009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51716006.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 155148009 is about 12455.8423641278. The cubic root of 155148009 is about 537.3394612678.

The spelling of 155148009 in words is "one hundred fifty-five million, one hundred forty-eight thousand, nine".