231303157 has 4 divisors (see below), whose sum is σ = 241359840. Its totient is φ = 221246476.

The previous prime is 231303151. The next prime is 231303167. The reversal of 231303157 is 751303132.

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 a de Polignac number, because none of the positive numbers 2^k-231303157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303151) 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, 5028307 + ... + 5028352.

It is an arithmetic number, because the mean of its divisors is an integer number (60339960).

Almost surely, 2^231303157 is an apocalyptic number.

It is an amenable number.

231303157 is a deficient number, since it is larger than the sum of its proper divisors (10056683).

231303157 is a wasteful number, since it uses less digits than its factorization.

231303157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10056682.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 231303157 is about 15208.6540167104. The cubic root of 231303157 is about 613.8475405471.

Subtracting from 231303157 its sum of digits (25), we obtain a palindrome (231303132).

Adding to 231303157 its reverse (751303132), we get a palindrome (982606289).

The spelling of 231303157 in words is "two hundred thirty-one million, three hundred three thousand, one hundred fifty-seven".