155109207 has 16 divisors (see below), whose sum is σ = 238885632. Its totient is φ = 88475520.

The previous prime is 155109137. The next prime is 155109223. The reversal of 155109207 is 702901551.

It is not a de Polignac number, because 155109207 - 2¹¹ = 155107159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155109277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137683 + ... + 138804.

It is an arithmetic number, because the mean of its divisors is an integer number (14930352).

Almost surely, 2^155109207 is an apocalyptic number.

155109207 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

155109207 is a deficient number, since it is larger than the sum of its proper divisors (83776425).

155109207 is a wasteful number, since it uses less digits than its factorization.

155109207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276518.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 155109207 is about 12454.2846843968. The cubic root of 155109207 is about 537.2946619300.

The spelling of 155109207 in words is "one hundred fifty-five million, one hundred nine thousand, two hundred seven".