231532501542501 has 4 divisors (see below), whose sum is σ = 308710002056672. Its totient is φ = 154355001028332.

The previous prime is 231532501542467. The next prime is 231532501542541. The reversal of 231532501542501 is 105245105235132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231532501542501 - 2¹³ = 231532501534309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231532501542501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231532501542541) 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, 38588750257081 + ... + 38588750257086.

It is an arithmetic number, because the mean of its divisors is an integer number (77177500514168).

Almost surely, 2^{231532501542501} is an apocalyptic number.

It is an amenable number.

231532501542501 is a deficient number, since it is larger than the sum of its proper divisors (77177500514171).

231532501542501 is an equidigital number, since it uses as much as digits as its factorization.

231532501542501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77177500514170.

The product of its (nonzero) digits is 180000, while the sum is 39.

Adding to 231532501542501 its reverse (105245105235132), we get a palindrome (336777606777633).

The spelling of 231532501542501 in words is "two hundred thirty-one trillion, five hundred thirty-two billion, five hundred one million, five hundred forty-two thousand, five hundred one".