231145501 has 4 divisors (see below), whose sum is σ = 232155100. Its totient is φ = 230135904.

The previous prime is 231145451. The next prime is 231145567. The reversal of 231145501 is 105541132.

It is a happy number.

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 187717401 + 43428100 = 13701^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 231145501 - 2⁷ = 231145373 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 (231145571) 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, 504456 + ... + 504913.

It is an arithmetic number, because the mean of its divisors is an integer number (58038775).

Almost surely, 2^231145501 is an apocalyptic number.

It is an amenable number.

231145501 is a deficient number, since it is larger than the sum of its proper divisors (1009599).

231145501 is a wasteful number, since it uses less digits than its factorization.

231145501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009598.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 231145501 is about 15203.4700315421. The cubic root of 231145501 is about 613.7080428924.

Adding to 231145501 its reverse (105541132), we get a palindrome (336686633).

The spelling of 231145501 in words is "two hundred thirty-one million, one hundred forty-five thousand, five hundred one".