31140203641 has 2 divisors, whose sum is σ = 31140203642. Its totient is φ = 31140203640.

The previous prime is 31140203639. The next prime is 31140203707. The reversal of 31140203641 is 14630204113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29645608041 + 1494595600 = 172179^2 + 38660^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140203641 - 2¹ = 31140203639 is a prime.

Together with 31140203639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31140203041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570101820 + 15570101821.

It is an arithmetic number, because the mean of its divisors is an integer number (15570101821).

Almost surely, 2^31140203641 is an apocalyptic number.

It is an amenable number.

31140203641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140203641 is an equidigital number, since it uses as much as digits as its factorization.

31140203641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31140203641 its reverse (14630204113), we get a palindrome (45770407754).

The spelling of 31140203641 in words is "thirty-one billion, one hundred forty million, two hundred three thousand, six hundred forty-one".