231991904739 has 16 divisors (see below), whose sum is σ = 354375818240. Its totient is φ = 132242673600.

The previous prime is 231991904671. The next prime is 231991904741. The reversal of 231991904739 is 937409199132.

231991904739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231991904739 - 2⁷ = 231991904611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231991904779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13496587 + ... + 13513764.

It is an arithmetic number, because the mean of its divisors is an integer number (22148488640).

Almost surely, 2^231991904739 is an apocalyptic number.

231991904739 is a deficient number, since it is larger than the sum of its proper divisors (122383913501).

231991904739 is a wasteful number, since it uses less digits than its factorization.

231991904739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27010770.

The product of its (nonzero) digits is 3306744, while the sum is 57.

The spelling of 231991904739 in words is "two hundred thirty-one billion, nine hundred ninety-one million, nine hundred four thousand, seven hundred thirty-nine".