155020031 has 8 divisors (see below), whose sum is σ = 166974720. Its totient is φ = 143444952.

The previous prime is 155019989. The next prime is 155020037. The reversal of 155020031 is 130020551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155020031 is a prime.

It is a super-2 number, since 2×155020031² = 48062420022481922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155019991 and 155020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155020037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94055 + ... + 95688.

It is an arithmetic number, because the mean of its divisors is an integer number (20871840).

Almost surely, 2^155020031 is an apocalyptic number.

155020031 is a deficient number, since it is larger than the sum of its proper divisors (11954689).

155020031 is a wasteful number, since it uses less digits than its factorization.

155020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189805.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 155020031 is about 12450.7040363186. The cubic root of 155020031 is about 537.1916743320.

Adding to 155020031 its reverse (130020551), we get a palindrome (285040582).

The spelling of 155020031 in words is "one hundred fifty-five million, twenty thousand, thirty-one".