19740631111 has 2 divisors, whose sum is σ = 19740631112. Its totient is φ = 19740631110.

The previous prime is 19740631109. The next prime is 19740631147. The reversal of 19740631111 is 11113604791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19740631111 - 2¹ = 19740631109 is a prime.

Together with 19740631109, 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 (19740631411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870315555 + 9870315556.

It is an arithmetic number, because the mean of its divisors is an integer number (9870315556).

Almost surely, 2^19740631111 is an apocalyptic number.

19740631111 is a deficient number, since it is larger than the sum of its proper divisors (1).

19740631111 is an equidigital number, since it uses as much as digits as its factorization.

19740631111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 19740631111 in words is "nineteen billion, seven hundred forty million, six hundred thirty-one thousand, one hundred eleven".