155442031 has 4 divisors (see below), whose sum is σ = 156666112. Its totient is φ = 154217952.

The previous prime is 155442017. The next prime is 155442037. The reversal of 155442031 is 130244551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155442031 - 2⁹ = 155441519 is a prime.

It is a super-2 number, since 2×155442031² = 48324450002809922, 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 = 155441987 and 155442005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155442037) 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 3 ways as a sum of consecutive naturals, for example, 611850 + ... + 612103.

It is an arithmetic number, because the mean of its divisors is an integer number (39166528).

Almost surely, 2^155442031 is an apocalyptic number.

155442031 is a deficient number, since it is larger than the sum of its proper divisors (1224081).

155442031 is a wasteful number, since it uses less digits than its factorization.

155442031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224080.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155442031 is about 12467.6393515372. The cubic root of 155442031 is about 537.6786855708.

Adding to 155442031 its reverse (130244551), we get a palindrome (285686582).

The spelling of 155442031 in words is "one hundred fifty-five million, four hundred forty-two thousand, thirty-one".