31400247121 has 4 divisors (see below), whose sum is σ = 31440869172. Its totient is φ = 31359625072.

The previous prime is 31400247119. The next prime is 31400247143. The reversal of 31400247121 is 12174200413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6895475521 + 24504771600 = 83039^2 + 156540^2 .

It is a cyclic number.

It is not a de Polignac number, because 31400247121 - 2¹ = 31400247119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31400247101) 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, 20309866 + ... + 20311411.

It is an arithmetic number, because the mean of its divisors is an integer number (7860217293).

Almost surely, 2^31400247121 is an apocalyptic number.

It is an amenable number.

31400247121 is a deficient number, since it is larger than the sum of its proper divisors (40622051).

31400247121 is an equidigital number, since it uses as much as digits as its factorization.

31400247121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40622050.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 31400247121 its reverse (12174200413), we get a palindrome (43574447534).

The spelling of 31400247121 in words is "thirty-one billion, four hundred million, two hundred forty-seven thousand, one hundred twenty-one".