231505434 has 72 divisors (see below), whose sum is σ = 533585052. Its totient is φ = 72495360.

The previous prime is 231505429. The next prime is 231505457. The reversal of 231505434 is 434505132.

It can be written as a sum of positive squares in 6 ways, for example, as 63154809 + 168350625 = 7947^2 + 12975^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231505398 and 231505407.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 620472 + ... + 620844.

Almost surely, 2^231505434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231505434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266792526).

231505434 is an abundant number, since it is smaller than the sum of its proper divisors (302079618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231505434 is a wasteful number, since it uses less digits than its factorization.

231505434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 231505434 is about 15215.3026259749. The cubic root of 231505434 is about 614.0264270828.

The spelling of 231505434 in words is "two hundred thirty-one million, five hundred five thousand, four hundred thirty-four".