231401433 has 12 divisors (see below), whose sum is σ = 327753200. Its totient is φ = 145192512.

The previous prime is 231401431. The next prime is 231401449. The reversal of 231401433 is 334104132.

It is not a de Polignac number, because 231401433 - 2¹ = 231401431 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231401431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132583 + ... + 134316.

Almost surely, 2^231401433 is an apocalyptic number.

It is an amenable number.

231401433 is a deficient number, since it is larger than the sum of its proper divisors (96351767).

231401433 is a wasteful number, since it uses less digits than its factorization.

231401433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266936 (or 266919 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231401433 is about 15211.8845972483. The cubic root of 231401433 is about 613.9344653429.

Adding to 231401433 its reverse (334104132), we get a palindrome (565505565).

The spelling of 231401433 in words is "two hundred thirty-one million, four hundred one thousand, four hundred thirty-three".