231428837 has 4 divisors (see below), whose sum is σ = 245042316. Its totient is φ = 217815360.

The previous prime is 231428819. The next prime is 231428843. The reversal of 231428837 is 738824132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105966436 + 125462401 = 10294^2 + 11201^2 .

It is a cyclic number.

It is not a de Polignac number, because 231428837 - 2⁶ = 231428773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231428837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231425837) 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, 6806714 + ... + 6806747.

It is an arithmetic number, because the mean of its divisors is an integer number (61260579).

Almost surely, 2^231428837 is an apocalyptic number.

It is an amenable number.

231428837 is a deficient number, since it is larger than the sum of its proper divisors (13613479).

231428837 is a wasteful number, since it uses less digits than its factorization.

231428837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13613478.

The product of its digits is 64512, while the sum is 38.

The square root of 231428837 is about 15212.7853136761. The cubic root of 231428837 is about 613.9586997016.

The spelling of 231428837 in words is "two hundred thirty-one million, four hundred twenty-eight thousand, eight hundred thirty-seven".