31020230231 has 4 divisors (see below), whose sum is σ = 31020609312. Its totient is φ = 31019851152.

The previous prime is 31020230201. The next prime is 31020230233. The reversal of 31020230231 is 13203202013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13203202013 = 73 ⋅180865781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020230231 is a prime.

It is a super-2 number, since 2×31020230231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020230233) 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, 10286 + ... + 249291.

It is an arithmetic number, because the mean of its divisors is an integer number (7755152328).

Almost surely, 2^31020230231 is an apocalyptic number.

31020230231 is a deficient number, since it is larger than the sum of its proper divisors (379081).

31020230231 is a wasteful number, since it uses less digits than its factorization.

31020230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379080.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31020230231 its reverse (13203202013), we get a palindrome (44223432244).

The spelling of 31020230231 in words is "thirty-one billion, twenty million, two hundred thirty thousand, two hundred thirty-one".