231487 has 4 divisors (see below), whose sum is σ = 234360. Its totient is φ = 228616.

The previous prime is 231481. The next prime is 231493. The reversal of 231487 is 784132.

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

It is an interprime number because it is at equal distance from previous prime (231481) and next prime (231493).

It is a cyclic number.

It is not a de Polignac number, because 231487 - 2³ = 231479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231481) 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, 1312 + ... + 1477.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2²³¹⁴⁸⁷ is an apocalyptic number.

231487 is a deficient number, since it is larger than the sum of its proper divisors (2873).

231487 is an equidigital number, since it uses as much as digits as its factorization.

231487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872.

The product of its digits is 1344, while the sum is 25.

The square root of 231487 is about 481.1309593032. The cubic root of 231487 is about 61.4010129030.

It can be divided in two parts, 2314 and 87, that added together give a 4-th power (2401 = 7⁴).

The spelling of 231487 in words is "two hundred thirty-one thousand, four hundred eighty-seven".