231998493 has 32 divisors (see below), whose sum is σ = 341544960. Its totient is φ = 139423680.

The previous prime is 231998491. The next prime is 231998497. The reversal of 231998493 is 394899132.

It is not a de Polignac number, because 231998493 - 2¹ = 231998491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231998491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354955 + ... + 355607.

It is an arithmetic number, because the mean of its divisors is an integer number (10673280).

Almost surely, 2^231998493 is an apocalyptic number.

231998493 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231998493 is a deficient number, since it is larger than the sum of its proper divisors (109546467).

231998493 is a wasteful number, since it uses less digits than its factorization.

231998493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 419904, while the sum is 48.

The square root of 231998493 is about 15231.4967419489. The cubic root of 231998493 is about 614.4620346798.

The spelling of 231998493 in words is "two hundred thirty-one million, nine hundred ninety-eight thousand, four hundred ninety-three".