231455638 has 4 divisors (see below), whose sum is σ = 347183460. Its totient is φ = 115727818.

The previous prime is 231455633. The next prime is 231455639. The reversal of 231455638 is 836554132.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 231455597 and 231455606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231455633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57863908 + ... + 57863911.

It is an arithmetic number, because the mean of its divisors is an integer number (86795865).

Almost surely, 2^231455638 is an apocalyptic number.

231455638 is a deficient number, since it is larger than the sum of its proper divisors (115727822).

231455638 is a wasteful number, since it uses less digits than its factorization.

231455638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115727821.

The product of its digits is 86400, while the sum is 37.

The square root of 231455638 is about 15213.6661590821. Note that the first 3 decimals coincide. The cubic root of 231455638 is about 613.9823989550.

The spelling of 231455638 in words is "two hundred thirty-one million, four hundred fifty-five thousand, six hundred thirty-eight".