231401633 has 4 divisors (see below), whose sum is σ = 236325120. Its totient is φ = 226478148.

The previous prime is 231401591. The next prime is 231401699. The reversal of 231401633 is 336104132.

231401633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231401633 - 2¹⁶ = 231336097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231401599 and 231401608.

It is not an unprimeable number, because it can be changed into a prime (231401333) 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, 2461673 + ... + 2461766.

It is an arithmetic number, because the mean of its divisors is an integer number (59081280).

Almost surely, 2^231401633 is an apocalyptic number.

It is an amenable number.

231401633 is a deficient number, since it is larger than the sum of its proper divisors (4923487).

231401633 is an equidigital number, since it uses as much as digits as its factorization.

231401633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923486.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 231401633 is about 15211.8911710543. The cubic root of 231401633 is about 613.9346422172.

Adding to 231401633 its reverse (336104132), we get a palindrome (567505765).

The spelling of 231401633 in words is "two hundred thirty-one million, four hundred one thousand, six hundred thirty-three".