231542783 has 4 divisors (see below), whose sum is σ = 233929920. Its totient is φ = 229155648.

The previous prime is 231542761. The next prime is 231542807. The reversal of 231542783 is 387245132.

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

It is a cyclic number.

It is not a de Polignac number, because 231542783 - 2¹² = 231538687 is a prime.

It is a super-2 number, since 2×231542783² = 107224120718770178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231542713) 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, 1193423 + ... + 1193616.

It is an arithmetic number, because the mean of its divisors is an integer number (58482480).

Almost surely, 2^231542783 is an apocalyptic number.

231542783 is a deficient number, since it is larger than the sum of its proper divisors (2387137).

231542783 is an equidigital number, since it uses as much as digits as its factorization.

231542783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387136.

The product of its digits is 40320, while the sum is 35.

The square root of 231542783 is about 15216.5299263663. The cubic root of 231542783 is about 614.0594458036.

The spelling of 231542783 in words is "two hundred thirty-one million, five hundred forty-two thousand, seven hundred eighty-three".