155109031 has 16 divisors (see below), whose sum is σ = 196558848. Its totient is φ = 118879200.

The previous prime is 155109029. The next prime is 155109047. The reversal of 155109031 is 130901551.

It is not a de Polignac number, because 155109031 - 2¹ = 155109029 is a prime.

It is a super-3 number, since 3×155109031³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155108987 and 155109005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155109001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11815 + ... + 21208.

It is an arithmetic number, because the mean of its divisors is an integer number (12284928).

Almost surely, 2^155109031 is an apocalyptic number.

155109031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155109031 is a deficient number, since it is larger than the sum of its proper divisors (41449817).

155109031 is a wasteful number, since it uses less digits than its factorization.

155109031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33102.

The product of its (nonzero) digits is 675, while the sum is 25.

The square root of 155109031 is about 12454.2776185534. The cubic root of 155109031 is about 537.2944587100.

The spelling of 155109031 in words is "one hundred fifty-five million, one hundred nine thousand, thirty-one".