31140321451 has 4 divisors (see below), whose sum is σ = 31234401304. Its totient is φ = 31046241600.

The previous prime is 31140321449. The next prime is 31140321463. The reversal of 31140321451 is 15412304113.

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

It is a cyclic number.

It is not a de Polignac number, because 31140321451 - 2¹ = 31140321449 is a prime.

It is a super-2 number, since 2×31140321451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31141321451) 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, 47039430 + ... + 47040091.

It is an arithmetic number, because the mean of its divisors is an integer number (7808600326).

Almost surely, 2^31140321451 is an apocalyptic number.

31140321451 is a deficient number, since it is larger than the sum of its proper divisors (94079853).

31140321451 is an equidigital number, since it uses as much as digits as its factorization.

31140321451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94079852.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 31140321451 its reverse (15412304113), we get a palindrome (46552625564).

The spelling of 31140321451 in words is "thirty-one billion, one hundred forty million, three hundred twenty-one thousand, four hundred fifty-one".