252135145531 has 4 divisors (see below), whose sum is σ = 252136170000. Its totient is φ = 252134121064.

The previous prime is 252135145529. The next prime is 252135145573. The reversal of 252135145531 is 135541531252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 252135145531 - 2¹ = 252135145529 is a prime.

It is a super-2 number, since 2×252135145531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252135145511) 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, 104265 + ... + 717733.

It is an arithmetic number, because the mean of its divisors is an integer number (63034042500).

Almost surely, 2^252135145531 is an apocalyptic number.

252135145531 is a deficient number, since it is larger than the sum of its proper divisors (1024469).

252135145531 is an equidigital number, since it uses as much as digits as its factorization.

252135145531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024468.

The product of its digits is 90000, while the sum is 37.

Adding to 252135145531 its reverse (135541531252), we get a palindrome (387676676783).

The spelling of 252135145531 in words is "two hundred fifty-two billion, one hundred thirty-five million, one hundred forty-five thousand, five hundred thirty-one".