231520001540145 has 32 divisors (see below), whose sum is σ = 389937453235200. Its totient is φ = 116975818217664.

The previous prime is 231520001540099. The next prime is 231520001540173. The reversal of 231520001540145 is 541045100025132.

It is not a de Polignac number, because 231520001540145 - 2⁶ = 231520001540081 is a prime.

It is a super-2 number, since 2×231520001540145² (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 31 ways as a sum of consecutive naturals, for example, 2951476 + ... + 21719834.

It is an arithmetic number, because the mean of its divisors is an integer number (12185545413600).

Almost surely, 2^{231520001540145} is an apocalyptic number.

It is an amenable number.

231520001540145 is a deficient number, since it is larger than the sum of its proper divisors (158417451695055).

231520001540145 is a wasteful number, since it uses less digits than its factorization.

231520001540145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18811669.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 231520001540145 its reverse (541045100025132), we get a palindrome (772565101565277).

The spelling of 231520001540145 in words is "two hundred thirty-one trillion, five hundred twenty billion, one million, five hundred forty thousand, one hundred forty-five".