231957481 has 4 divisors (see below), whose sum is σ = 265094272. Its totient is φ = 198820692.

The previous prime is 231957463. The next prime is 231957487. The reversal of 231957481 is 184759132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231957481 - 2⁵ = 231957449 is a prime.

It is a super-2 number, since 2×231957481² = 107608545983730722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231957487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16568385 + ... + 16568398.

It is an arithmetic number, because the mean of its divisors is an integer number (66273568).

Almost surely, 2^231957481 is an apocalyptic number.

It is an amenable number.

231957481 is a deficient number, since it is larger than the sum of its proper divisors (33136791).

231957481 is an equidigital number, since it uses as much as digits as its factorization.

231957481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33136790.

The product of its digits is 60480, while the sum is 40.

The square root of 231957481 is about 15230.1503932167. The cubic root of 231957481 is about 614.4258249589.

The spelling of 231957481 in words is "two hundred thirty-one million, nine hundred fifty-seven thousand, four hundred eighty-one".