1220377381 has 2 divisors, whose sum is σ = 1220377382. Its totient is φ = 1220377380.

The previous prime is 1220377363. The next prime is 1220377387. The reversal of 1220377381 is 1837730221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1166222500 + 54154881 = 34150^2 + 7359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220377381 - 2²⁷ = 1086159653 is a prime.

It is a super-2 number, since 2×1220377381² = 2978641904112838322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220377387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610188690 + 610188691.

It is an arithmetic number, because the mean of its divisors is an integer number (610188691).

Almost surely, 2^1220377381 is an apocalyptic number.

It is an amenable number.

1220377381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220377381 is an equidigital number, since it uses as much as digits as its factorization.

1220377381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1220377381 is about 34933.9001687473. The cubic root of 1220377381 is about 1068.6398944240.

The spelling of 1220377381 in words is "one billion, two hundred twenty million, three hundred seventy-seven thousand, three hundred eighty-one".