31431401971 has 2 divisors, whose sum is σ = 31431401972. Its totient is φ = 31431401970.

The previous prime is 31431401941. The next prime is 31431401977. The reversal of 31431401971 is 17910413413.

It is a strong prime.

It is an emirp because it is prime and its reverse (17910413413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31431401971 - 2¹⁹ = 31430877683 is a prime.

It is not a weakly prime, because it can be changed into another prime (31431401977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715700985 + 15715700986.

It is an arithmetic number, because the mean of its divisors is an integer number (15715700986).

Almost surely, 2^31431401971 is an apocalyptic number.

31431401971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431401971 is an equidigital number, since it uses as much as digits as its factorization.

31431401971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 31431401971 in words is "thirty-one billion, four hundred thirty-one million, four hundred one thousand, nine hundred seventy-one".