155649317 has 4 divisors (see below), whose sum is σ = 156347520. Its totient is φ = 154951116.

The previous prime is 155649313. The next prime is 155649337. The reversal of 155649317 is 713946551.

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.

It is a cyclic number.

It is not a de Polignac number, because 155649317 - 2² = 155649313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155649313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348767 + ... + 349212.

It is an arithmetic number, because the mean of its divisors is an integer number (39086880).

Almost surely, 2^155649317 is an apocalyptic number.

It is an amenable number.

155649317 is a deficient number, since it is larger than the sum of its proper divisors (698203).

155649317 is an equidigital number, since it uses as much as digits as its factorization.

155649317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698202.

The product of its digits is 113400, while the sum is 41.

The square root of 155649317 is about 12475.9495430208. The cubic root of 155649317 is about 537.9175822579.

The spelling of 155649317 in words is "one hundred fifty-five million, six hundred forty-nine thousand, three hundred seventeen".