155131423 has 4 divisors (see below), whose sum is σ = 155240080. Its totient is φ = 155022768.

The previous prime is 155131373. The next prime is 155131429. The reversal of 155131423 is 324131551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324131551 = 11321 ⋅28631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155131423 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 (155131429) 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, 52158 + ... + 55051.

It is an arithmetic number, because the mean of its divisors is an integer number (38810020).

Almost surely, 2^155131423 is an apocalyptic number.

155131423 is a deficient number, since it is larger than the sum of its proper divisors (108657).

155131423 is a wasteful number, since it uses less digits than its factorization.

155131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108656.

The product of its digits is 1800, while the sum is 25.

The square root of 155131423 is about 12455.1765543488. The cubic root of 155131423 is about 537.3203126067.

Adding to 155131423 its reverse (324131551), we get a palindrome (479262974).

The spelling of 155131423 in words is "one hundred fifty-five million, one hundred thirty-one thousand, four hundred twenty-three".