231131501 has 8 divisors (see below), whose sum is σ = 235830144. Its totient is φ = 226462320.

The previous prime is 231131471. The next prime is 231131521. The reversal of 231131501 is 105131132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231131501 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 231131501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8840 + ... + 23246.

It is an arithmetic number, because the mean of its divisors is an integer number (29478768).

Almost surely, 2^231131501 is an apocalyptic number.

It is an amenable number.

231131501 is a deficient number, since it is larger than the sum of its proper divisors (4698643).

231131501 is a wasteful number, since it uses less digits than its factorization.

231131501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14731.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 231131501 is about 15203.0096033647. The cubic root of 231131501 is about 613.6956523043.

Adding to 231131501 its reverse (105131132), we get a palindrome (336262633).

The spelling of 231131501 in words is "two hundred thirty-one million, one hundred thirty-one thousand, five hundred one".