1227919779731 has 2 divisors, whose sum is σ = 1227919779732. Its totient is φ = 1227919779730.

The previous prime is 1227919779631. The next prime is 1227919779739. The reversal of 1227919779731 is 1379779197221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1379779197221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227919779731 is a prime.

It is a super-2 number, since 2×1227919779731² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1227919779739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613959889865 + 613959889866.

It is an arithmetic number, because the mean of its divisors is an integer number (613959889866).

Almost surely, 2^{1227919779731} is an apocalyptic number.

1227919779731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227919779731 is an equidigital number, since it uses as much as digits as its factorization.

1227919779731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21003948, while the sum is 65.

The spelling of 1227919779731 in words is "one trillion, two hundred twenty-seven billion, nine hundred nineteen million, seven hundred seventy-nine thousand, seven hundred thirty-one".