31124431461 has 4 divisors (see below), whose sum is σ = 41499241952. Its totient is φ = 20749620972.

The previous prime is 31124431423. The next prime is 31124431517. The reversal of 31124431461 is 16413442113.

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 31124431461 - 2⁹ = 31124430949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31124431421) 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, 5187405241 + ... + 5187405246.

It is an arithmetic number, because the mean of its divisors is an integer number (10374810488).

Almost surely, 2^31124431461 is an apocalyptic number.

It is an amenable number.

31124431461 is a deficient number, since it is larger than the sum of its proper divisors (10374810491).

31124431461 is a wasteful number, since it uses less digits than its factorization.

31124431461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374810490.

The product of its digits is 6912, while the sum is 30.

Adding to 31124431461 its reverse (16413442113), we get a palindrome (47537873574).

The spelling of 31124431461 in words is "thirty-one billion, one hundred twenty-four million, four hundred thirty-one thousand, four hundred sixty-one".