31420803181 has 2 divisors, whose sum is σ = 31420803182. Its totient is φ = 31420803180.

The previous prime is 31420803157. The next prime is 31420803199. The reversal of 31420803181 is 18130802413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28971444100 + 2449359081 = 170210^2 + 49491^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420803181 - 2¹⁹ = 31420278893 is a prime.

It is a super-2 number, since 2×31420803181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420803121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710401590 + 15710401591.

It is an arithmetic number, because the mean of its divisors is an integer number (15710401591).

Almost surely, 2^31420803181 is an apocalyptic number.

It is an amenable number.

31420803181 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420803181 is an equidigital number, since it uses as much as digits as its factorization.

31420803181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 31420803181 in words is "thirty-one billion, four hundred twenty million, eight hundred three thousand, one hundred eighty-one".