155140331 has 4 divisors (see below), whose sum is σ = 155392392. Its totient is φ = 154888272.

The previous prime is 155140319. The next prime is 155140333. The reversal of 155140331 is 133041551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133041551 = 73 ⋅1822487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155140331 is a prime.

It is a super-2 number, since 2×155140331² = 48137044605579122, 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 = 155140297 and 155140306.

It is not an unprimeable number, because it can be changed into a prime (155140333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125105 + ... + 126338.

It is an arithmetic number, because the mean of its divisors is an integer number (38848098).

Almost surely, 2^155140331 is an apocalyptic number.

155140331 is a deficient number, since it is larger than the sum of its proper divisors (252061).

155140331 is an equidigital number, since it uses as much as digits as its factorization.

155140331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252060.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 155140331 is about 12455.5341515328. The cubic root of 155140331 is about 537.3305971290.

Adding to 155140331 its reverse (133041551), we get a palindrome (288181882).

The spelling of 155140331 in words is "one hundred fifty-five million, one hundred forty thousand, three hundred thirty-one".