1227919779631 has 2 divisors, whose sum is σ = 1227919779632. Its totient is φ = 1227919779630.

The previous prime is 1227919779617. The next prime is 1227919779731. The reversal of 1227919779631 is 1369779197221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227919779631 is a prime.

It is a super-2 number, since 2×1227919779631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227919779731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613959889815 + 613959889816.

It is an arithmetic number, because the mean of its divisors is an integer number (613959889816).

Almost surely, 2^{1227919779631} is an apocalyptic number.

1227919779631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227919779631 is an equidigital number, since it uses as much as digits as its factorization.

1227919779631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18003384, while the sum is 64.

The spelling of 1227919779631 in words is "one trillion, two hundred twenty-seven billion, nine hundred nineteen million, seven hundred seventy-nine thousand, six hundred thirty-one".