231749879 has 2 divisors, whose sum is σ = 231749880. Its totient is φ = 231749878.

The previous prime is 231749839. The next prime is 231749887. The reversal of 231749879 is 978947132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231749879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231749839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115874939 + 115874940.

It is an arithmetic number, because the mean of its divisors is an integer number (115874940).

Almost surely, 2^231749879 is an apocalyptic number.

231749879 is a deficient number, since it is larger than the sum of its proper divisors (1).

231749879 is an equidigital number, since it uses as much as digits as its factorization.

231749879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 231749879 is about 15223.3333734764. Note that the first 4 decimals coincide. The cubic root of 231749879 is about 614.2424664935.

The spelling of 231749879 in words is "two hundred thirty-one million, seven hundred forty-nine thousand, eight hundred seventy-nine".