155121241141231 has 4 divisors (see below), whose sum is σ = 157436483546392. Its totient is φ = 152805998736072.

The previous prime is 155121241141219. The next prime is 155121241141261. The reversal of 155121241141231 is 132141142121551.

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 155121241141231 - 2²³ = 155121232752623 is a prime.

It is a super-2 number, since 2×155121241141231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155121241141261) 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, 1157621202480 + ... + 1157621202613.

It is an arithmetic number, because the mean of its divisors is an integer number (39359120886598).

Almost surely, 2^{155121241141231} is an apocalyptic number.

155121241141231 is a deficient number, since it is larger than the sum of its proper divisors (2315242405161).

155121241141231 is an equidigital number, since it uses as much as digits as its factorization.

155121241141231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315242405160.

The product of its digits is 9600, while the sum is 34.

Adding to 155121241141231 its reverse (132141142121551), we get a palindrome (287262383262782).

The spelling of 155121241141231 in words is "one hundred fifty-five trillion, one hundred twenty-one billion, two hundred forty-one million, one hundred forty-one thousand, two hundred thirty-one".