1378801181 has 2 divisors, whose sum is σ = 1378801182. Its totient is φ = 1378801180.

The previous prime is 1378801169. The next prime is 1378801183. The reversal of 1378801181 is 1811088731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943411225 + 435389956 = 30715^2 + 20866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378801181 is a prime.

It is a super-2 number, since 2×1378801181² = 3802185393453989522, which contains 22 as substring.

Together with 1378801183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378801183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689400590 + 689400591.

It is an arithmetic number, because the mean of its divisors is an integer number (689400591).

Almost surely, 2^1378801181 is an apocalyptic number.

It is an amenable number.

1378801181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378801181 is an equidigital number, since it uses as much as digits as its factorization.

1378801181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 38.

The square root of 1378801181 is about 37132.2121748759. The cubic root of 1378801181 is about 1113.0137995500.

The spelling of 1378801181 in words is "one billion, three hundred seventy-eight million, eight hundred one thousand, one hundred eighty-one".