219137379731 has 2 divisors, whose sum is σ = 219137379732. Its totient is φ = 219137379730.

The previous prime is 219137379707. The next prime is 219137379761. The reversal of 219137379731 is 137973731912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219137379731 is a prime.

It is a super-2 number, since 2×219137379731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219137379761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109568689865 + 109568689866.

It is an arithmetic number, because the mean of its divisors is an integer number (109568689866).

Almost surely, 2^219137379731 is an apocalyptic number.

219137379731 is a deficient number, since it is larger than the sum of its proper divisors (1).

219137379731 is an equidigital number, since it uses as much as digits as its factorization.

219137379731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500282, while the sum is 53.

The spelling of 219137379731 in words is "two hundred nineteen billion, one hundred thirty-seven million, three hundred seventy-nine thousand, seven hundred thirty-one".