1228877381 has 2 divisors, whose sum is σ = 1228877382. Its totient is φ = 1228877380.

The previous prime is 1228877371. The next prime is 1228877399. The reversal of 1228877381 is 1837788221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743380225 + 485497156 = 27265^2 + 22034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228877381 is a prime.

It is a super-2 number, since 2×1228877381² = 3020279235066838322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228877341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614438690 + 614438691.

It is an arithmetic number, because the mean of its divisors is an integer number (614438691).

Almost surely, 2^1228877381 is an apocalyptic number.

It is an amenable number.

1228877381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228877381 is an equidigital number, since it uses as much as digits as its factorization.

1228877381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301056, while the sum is 47.

The square root of 1228877381 is about 35055.3473952263. The cubic root of 1228877381 is about 1071.1152029022.

The spelling of 1228877381 in words is "one billion, two hundred twenty-eight million, eight hundred seventy-seven thousand, three hundred eighty-one".