155240131 has 4 divisors (see below), whose sum is σ = 156777264. Its totient is φ = 153703000.

The previous prime is 155240117. The next prime is 155240143. The reversal of 155240131 is 131042551.

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: 131042551 = 101 ⋅1297451.

It is a cyclic number.

It is not a de Polignac number, because 155240131 - 2¹³ = 155231939 is a prime.

It is a super-2 number, since 2×155240131² = 48198996545794322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155240171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768415 + ... + 768616.

It is an arithmetic number, because the mean of its divisors is an integer number (39194316).

Almost surely, 2^155240131 is an apocalyptic number.

155240131 is a deficient number, since it is larger than the sum of its proper divisors (1537133).

155240131 is a wasteful number, since it uses less digits than its factorization.

155240131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537132.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 155240131 is about 12459.5397587551. The cubic root of 155240131 is about 537.4457919732.

Adding to 155240131 its reverse (131042551), we get a palindrome (286282682).

The spelling of 155240131 in words is "one hundred fifty-five million, two hundred forty thousand, one hundred thirty-one".