231520000012145 has 8 divisors (see below), whose sum is σ = 299195076938856. Its totient is φ = 170968615393536.

The previous prime is 231520000012141. The next prime is 231520000012151. The reversal of 231520000012145 is 541210000025132.

It can be written as a sum of positive squares in 4 ways, for example, as 2526475281121 + 228993524731024 = 1589489^2 + 15132532^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231520000012145 - 2² = 231520000012141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231520000012141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1780923076952 + ... + 1780923077081.

It is an arithmetic number, because the mean of its divisors is an integer number (37399384617357).

Almost surely, 2^{231520000012145} is an apocalyptic number.

It is an amenable number.

231520000012145 is a deficient number, since it is larger than the sum of its proper divisors (67675076926711).

231520000012145 is a wasteful number, since it uses less digits than its factorization.

231520000012145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561846154051.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 231520000012145 its reverse (541210000025132), we get a palindrome (772730000037277).

The spelling of 231520000012145 in words is "two hundred thirty-one trillion, five hundred twenty billion, twelve thousand, one hundred forty-five".