231009497 has 4 divisors (see below), whose sum is σ = 231042000. Its totient is φ = 230976996.

The previous prime is 231009487. The next prime is 231009503. The reversal of 231009497 is 794900132.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231009497 - 2⁶ = 231009433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231009407) 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, 503 + ... + 21500.

It is an arithmetic number, because the mean of its divisors is an integer number (57760500).

Almost surely, 2^231009497 is an apocalyptic number.

It is an amenable number.

231009497 is a deficient number, since it is larger than the sum of its proper divisors (32503).

231009497 is a wasteful number, since it uses less digits than its factorization.

231009497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32502.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 231009497 is about 15198.9965787219. The cubic root of 231009497 is about 613.5876524543.

The spelling of 231009497 in words is "two hundred thirty-one million, nine thousand, four hundred ninety-seven".