231898505 has 4 divisors (see below), whose sum is σ = 278278212. Its totient is φ = 185518800.

The previous prime is 231898493. The next prime is 231898523. The reversal of 231898505 is 505898132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 104366656 + 127531849 = 10216^2 + 11293^2 .

It is not a de Polignac number, because 231898505 - 2¹⁴ = 231882121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23189846 + ... + 23189855.

It is an arithmetic number, because the mean of its divisors is an integer number (69569553).

Almost surely, 2^231898505 is an apocalyptic number.

It is an amenable number.

231898505 is a deficient number, since it is larger than the sum of its proper divisors (46379707).

231898505 is an equidigital number, since it uses as much as digits as its factorization.

231898505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46379706.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 231898505 is about 15228.2141106566. The cubic root of 231898505 is about 614.3737472408.

The spelling of 231898505 in words is "two hundred thirty-one million, eight hundred ninety-eight thousand, five hundred five".