65231031 has 4 divisors (see below), whose sum is σ = 86974712. Its totient is φ = 43487352.

The previous prime is 65231029. The next prime is 65231051. The reversal of 65231031 is 13013256.

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

It is not a de Polignac number, because 65231031 - 2¹ = 65231029 is a prime.

It is a super-2 number, since 2×65231031² = 8510174810645922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65230989 and 65231007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65231051) 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, 10871836 + ... + 10871841.

It is an arithmetic number, because the mean of its divisors is an integer number (21743678).

Almost surely, 2^65231031 is an apocalyptic number.

65231031 is a deficient number, since it is larger than the sum of its proper divisors (21743681).

65231031 is a wasteful number, since it uses less digits than its factorization.

65231031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21743680.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 65231031 is about 8076.5729737309. The cubic root of 65231031 is about 402.5483778637.

Adding to 65231031 its reverse (13013256), we get a palindrome (78244287).

The spelling of 65231031 in words is "sixty-five million, two hundred thirty-one thousand, thirty-one".