1227620893781 has 4 divisors (see below), whose sum is σ = 1228744061292. Its totient is φ = 1226497726272.

The previous prime is 1227620893771. The next prime is 1227620893843. The reversal of 1227620893781 is 1873980267221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1207833970225 + 19786923556 = 1099015^2 + 140666^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227620893781 - 2⁶ = 1227620893717 is a prime.

It is a super-2 number, since 2×1227620893781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1227620893771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561582116 + ... + 561584301.

It is an arithmetic number, because the mean of its divisors is an integer number (307186015323).

Almost surely, 2^{1227620893781} is an apocalyptic number.

It is an amenable number.

1227620893781 is a deficient number, since it is larger than the sum of its proper divisors (1123167511).

1227620893781 is a wasteful number, since it uses less digits than its factorization.

1227620893781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123167510.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 1227620893781 in words is "one trillion, two hundred twenty-seven billion, six hundred twenty million, eight hundred ninety-three thousand, seven hundred eighty-one".