31004220493 has 2 divisors, whose sum is σ = 31004220494. Its totient is φ = 31004220492.

The previous prime is 31004220491. The next prime is 31004220503. The reversal of 31004220493 is 39402240013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30968256484 + 35964009 = 175978^2 + 5997^2 .

It is a cyclic number.

It is not a de Polignac number, because 31004220493 - 2¹ = 31004220491 is a prime.

It is a super-2 number, since 2×31004220493² (a number of 22 digits) contains 22 as substring.

Together with 31004220491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31004220491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15502110246 + 15502110247.

It is an arithmetic number, because the mean of its divisors is an integer number (15502110247).

Almost surely, 2^31004220493 is an apocalyptic number.

It is an amenable number.

31004220493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31004220493 is an equidigital number, since it uses as much as digits as its factorization.

31004220493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 31004220493 in words is "thirty-one billion, four million, two hundred twenty thousand, four hundred ninety-three".