231020535 has 16 divisors (see below), whose sum is σ = 373445856. Its totient is φ = 121939968.

The previous prime is 231020519. The next prime is 231020551. The reversal of 231020535 is 535020132.

It is an interprime number because it is at equal distance from previous prime (231020519) and next prime (231020551).

It is not a de Polignac number, because 231020535 - 2⁴ = 231020519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77934 + ... + 80843.

It is an arithmetic number, because the mean of its divisors is an integer number (23340366).

Almost surely, 2^231020535 is an apocalyptic number.

231020535 is a deficient number, since it is larger than the sum of its proper divisors (142425321).

231020535 is a wasteful number, since it uses less digits than its factorization.

231020535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158882.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 231020535 is about 15199.3596904606. The cubic root of 231020535 is about 613.5974250289.

Adding to 231020535 its reverse (535020132), we get a palindrome (766040667).

The spelling of 231020535 in words is "two hundred thirty-one million, twenty thousand, five hundred thirty-five".