231533420251145 has 4 divisors (see below), whose sum is σ = 277840104301380. Its totient is φ = 185226736200912.

The previous prime is 231533420251097. The next prime is 231533420251151. The reversal of 231533420251145 is 541152024335132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105929936619529 + 125603483631616 = 10292227^2 + 11207296^2 .

It is a cyclic number.

It is not a de Polignac number, because 231533420251145 - 2⁴⁴ = 213941234206729 is a prime.

It is a super-2 number, since 2×231533420251145² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23153342025110 + ... + 23153342025119.

It is an arithmetic number, because the mean of its divisors is an integer number (69460026075345).

Almost surely, 2^{231533420251145} is an apocalyptic number.

It is an amenable number.

231533420251145 is a deficient number, since it is larger than the sum of its proper divisors (46306684050235).

231533420251145 is an equidigital number, since it uses as much as digits as its factorization.

231533420251145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46306684050234.

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 231533420251145 its reverse (541152024335132), we get a palindrome (772685444586277).

The spelling of 231533420251145 in words is "two hundred thirty-one trillion, five hundred thirty-three billion, four hundred twenty million, two hundred fifty-one thousand, one hundred forty-five".